WAEC SSCE - Geography - 1996 (Essay)
Ibeere 1 Ìròyìn
(a) Draw an annotated diagram to show the relief of the ocean basin
(b) Describe the characteristics of any two of the relief features shown on your diagram
(a) Annotated diagram of the relief of an ocean basin
(b) Characteristics of two relief features
1. Continental shelf
- It is the shallow, gently sloping submerged margin of a continent, extending from the coast to the shelf break.
- It is a continuation of the land beneath the sea and commonly has a very gentle gradient of about 1 in 500.
- It is generally less than 200 m deep and occupies about 7% of the total ocean area.
- It is rich in fish and is an important area for offshore petroleum exploitation and recreation.
2. Continental slope
- It is the relatively steep part of the ocean floor that descends from the outer edge of the continental shelf to the deep-sea plain.
- It commonly extends through depths of about 1,800 m to 5,400 m.
- It lies close to the continent and forms the boundary between the continental margin and the deep ocean basin.
- It may be cut by submarine canyons and is usually much steeper than the continental shelf.
Awọn alaye Idahun
(a) Annotated diagram of the relief of an ocean basin
(b) Characteristics of two relief features
1. Continental shelf
- It is the shallow, gently sloping submerged margin of a continent, extending from the coast to the shelf break.
- It is a continuation of the land beneath the sea and commonly has a very gentle gradient of about 1 in 500.
- It is generally less than 200 m deep and occupies about 7% of the total ocean area.
- It is rich in fish and is an important area for offshore petroleum exploitation and recreation.
2. Continental slope
- It is the relatively steep part of the ocean floor that descends from the outer edge of the continental shelf to the deep-sea plain.
- It commonly extends through depths of about 1,800 m to 5,400 m.
- It lies close to the continent and forms the boundary between the continental margin and the deep ocean basin.
- It may be cut by submarine canyons and is usually much steeper than the continental shelf.
Ibeere 2 Ìròyìn
(a) Give an example of a
(i) light industry? (ii) heavy industry?
(b) Describe any four characteristics of each type of industry
(c) Explain any three favourable factors for the location of any one of the industries
(a) Examples
- (i) Light industry: textile manufacturing (or soap-making, food processing, electronics assembly, shoe-making).
- (ii) Heavy industry: iron and steel production (or petroleum refining, cement manufacture, shipbuilding, vehicle assembly).
(b) Four characteristics of each type
Light industry
- Uses light, small and easily handled raw materials and produces small, finished consumer goods.
- Requires relatively little capital and space to set up.
- Employs a large amount of labour, often semi-skilled.
- Its factories are market-oriented, often located near towns and consumers; causes little pollution.
Heavy industry
- Uses large, bulky and heavy raw materials and produces heavy, often intermediate goods (steel, machinery).
- Requires very large capital investment and much space.
- Depends heavily on power, machinery and advanced technology rather than labour numbers.
- It is usually raw-material or power-oriented, located near mineral fields, ports or energy sources, and tends to cause more pollution.
(c) Three favourable factors for the location of an industry (e.g. iron and steel, a heavy industry)
- Nearness to raw materials: location close to iron ore, coal/coke and limestone reduces the high cost of transporting bulky, weight-losing materials.
- Availability of power/energy: steady supply of electricity, coal or gas is needed to run the heavy machinery and furnaces.
- Good transport and market: access to railways, roads or ports allows raw materials to be brought in and the heavy finished products to be moved to markets cheaply.
- Availability of capital and labour: large funds and skilled workers are needed to establish and run the plant.
Awọn alaye Idahun
(a) Examples
- (i) Light industry: textile manufacturing (or soap-making, food processing, electronics assembly, shoe-making).
- (ii) Heavy industry: iron and steel production (or petroleum refining, cement manufacture, shipbuilding, vehicle assembly).
(b) Four characteristics of each type
Light industry
- Uses light, small and easily handled raw materials and produces small, finished consumer goods.
- Requires relatively little capital and space to set up.
- Employs a large amount of labour, often semi-skilled.
- Its factories are market-oriented, often located near towns and consumers; causes little pollution.
Heavy industry
- Uses large, bulky and heavy raw materials and produces heavy, often intermediate goods (steel, machinery).
- Requires very large capital investment and much space.
- Depends heavily on power, machinery and advanced technology rather than labour numbers.
- It is usually raw-material or power-oriented, located near mineral fields, ports or energy sources, and tends to cause more pollution.
(c) Three favourable factors for the location of an industry (e.g. iron and steel, a heavy industry)
- Nearness to raw materials: location close to iron ore, coal/coke and limestone reduces the high cost of transporting bulky, weight-losing materials.
- Availability of power/energy: steady supply of electricity, coal or gas is needed to run the heavy machinery and furnaces.
- Good transport and market: access to railways, roads or ports allows raw materials to be brought in and the heavy finished products to be moved to markets cheaply.
- Availability of capital and labour: large funds and skilled workers are needed to establish and run the plant.
Ibeere 3 Ìròyìn
(a) Explain the term natural environment
(b) Highlight four advantages and four disadvantages of man's intervention with the natural environment
(a) The term natural environment
The natural environment refers to all the physical surroundings that exist naturally without being made or altered by man. It is made up of the living (biotic) and non-living (abiotic) components of the Earth. These include the land (relief, rocks and soils), water bodies (rivers, lakes, seas), the atmosphere (air and climate), and plant and animal life. In short, it is the total sum of natural features and conditions within which man lives and carries out his activities.
(b) Advantages and disadvantages of man's intervention with the natural environment
Four advantages
- Increased food production: clearing land, irrigation and mechanised farming raise agricultural output to feed a growing population.
- Provision of settlement and infrastructure: building of towns, roads, dams and industries provides shelter, employment and services.
- Harnessing of resources and energy: mining, damming of rivers for hydro-electricity and exploitation of forests supply raw materials and power for development.
- Control of natural hazards: construction of embankments, drainage and afforestation helps to control floods, erosion and desert advance.
Four disadvantages
- Deforestation and loss of vegetation: excessive clearing destroys forests and the habitats of wildlife, reducing biodiversity.
- Soil erosion and land degradation: overgrazing, bush burning and poor farming expose the soil, leading to gullying and loss of fertility.
- Pollution: industrial, oil and domestic wastes pollute the air, water and land, harming human and animal health.
- Climate change and desertification: emission of gases and removal of vegetation upset the climate and encourage the spread of deserts, drought and flooding.
Awọn alaye Idahun
(a) The term natural environment
The natural environment refers to all the physical surroundings that exist naturally without being made or altered by man. It is made up of the living (biotic) and non-living (abiotic) components of the Earth. These include the land (relief, rocks and soils), water bodies (rivers, lakes, seas), the atmosphere (air and climate), and plant and animal life. In short, it is the total sum of natural features and conditions within which man lives and carries out his activities.
(b) Advantages and disadvantages of man's intervention with the natural environment
Four advantages
- Increased food production: clearing land, irrigation and mechanised farming raise agricultural output to feed a growing population.
- Provision of settlement and infrastructure: building of towns, roads, dams and industries provides shelter, employment and services.
- Harnessing of resources and energy: mining, damming of rivers for hydro-electricity and exploitation of forests supply raw materials and power for development.
- Control of natural hazards: construction of embankments, drainage and afforestation helps to control floods, erosion and desert advance.
Four disadvantages
- Deforestation and loss of vegetation: excessive clearing destroys forests and the habitats of wildlife, reducing biodiversity.
- Soil erosion and land degradation: overgrazing, bush burning and poor farming expose the soil, leading to gullying and loss of fertility.
- Pollution: industrial, oil and domestic wastes pollute the air, water and land, harming human and animal health.
- Climate change and desertification: emission of gases and removal of vegetation upset the climate and encourage the spread of deserts, drought and flooding.
Ibeere 4 Ìròyìn
(a) Give three reasons why air transportation may be preferred to the other modes of transportation
(b) State any three disadvantages of air transportation
(c) How can these disadvantages be overcome?
(a) Three reasons why air transportation may be preferred to other modes
- Speed: it is by far the fastest means of transport, ideal for long distances and urgent goods or passengers.
- Access to difficult terrain: aircraft can cross seas, mountains, deserts, forests and swamps that road, rail and water cannot easily reach.
- Suitability for perishable and valuable goods: it moves perishable items (flowers, fish, medicines) and high-value light goods quickly before they spoil.
- Comfort and time-saving: it saves travellers' time and offers comfortable, direct long-distance travel; it is also vital in emergencies and relief operations.
(b) Three disadvantages of air transportation
- Very high cost: building airports and buying, fuelling and maintaining aircraft is expensive, so fares and freight charges are high.
- Limited carrying capacity: aircraft carry relatively small loads and cannot move bulky, heavy goods such as timber, minerals or machinery cheaply.
- Weather dependence and risk: flights are easily disrupted by fog, storms and poor visibility, and accidents, though rare, are usually fatal.
- It also requires skilled personnel and advanced technology, and needs large, specially prepared airports.
(c) How the disadvantages can be overcome
- Reduce cost through government subsidies, larger fuel-efficient aircraft and better management to lower fares.
- Improve capacity by using wide-bodied cargo aircraft for heavier loads and combining air with road/rail for bulky goods.
- Improve safety and weather handling by installing modern radar, navigation and communication equipment, regular maintenance, and training of skilled pilots and engineers.
- Provide more and better-equipped airports with all-weather runways and lighting.
Awọn alaye Idahun
(a) Three reasons why air transportation may be preferred to other modes
- Speed: it is by far the fastest means of transport, ideal for long distances and urgent goods or passengers.
- Access to difficult terrain: aircraft can cross seas, mountains, deserts, forests and swamps that road, rail and water cannot easily reach.
- Suitability for perishable and valuable goods: it moves perishable items (flowers, fish, medicines) and high-value light goods quickly before they spoil.
- Comfort and time-saving: it saves travellers' time and offers comfortable, direct long-distance travel; it is also vital in emergencies and relief operations.
(b) Three disadvantages of air transportation
- Very high cost: building airports and buying, fuelling and maintaining aircraft is expensive, so fares and freight charges are high.
- Limited carrying capacity: aircraft carry relatively small loads and cannot move bulky, heavy goods such as timber, minerals or machinery cheaply.
- Weather dependence and risk: flights are easily disrupted by fog, storms and poor visibility, and accidents, though rare, are usually fatal.
- It also requires skilled personnel and advanced technology, and needs large, specially prepared airports.
(c) How the disadvantages can be overcome
- Reduce cost through government subsidies, larger fuel-efficient aircraft and better management to lower fares.
- Improve capacity by using wide-bodied cargo aircraft for heavier loads and combining air with road/rail for bulky goods.
- Improve safety and weather handling by installing modern radar, navigation and communication equipment, regular maintenance, and training of skilled pilots and engineers.
- Provide more and better-equipped airports with all-weather runways and lighting.
Ibeere 5 Ìròyìn
(a) Explain any four problems facing Agriculture in Nigeria
(b) Highlight three effects of these problems on the economic development of Nigeria
(c) How can the problems in (a) above be solved?
(a) Four problems facing agriculture in Nigeria
- Poor and outdated methods: most farming is done on small scattered plots with simple tools (hoes and cutlasses) and little mechanisation, keeping output low.
- Inadequate finance and inputs: shortage of credit, improved seeds, fertilizers and modern machinery limits production and expansion.
- Poor storage, processing and transport: bad rural roads and lack of storage/processing facilities cause heavy post-harvest losses and difficulty in getting produce to market.
- Land tenure problems: the fragmented, inherited land-holding system makes it hard to acquire large blocks of land for commercial farming.
- Unfavourable natural factors: pests, diseases, drought, flooding and declining soil fertility reduce yields, while rural-urban migration causes a shortage of farm labour.
(b) Three effects of these problems on economic development
- Low food production and food insecurity: insufficient food raises prices, causes hunger and forces costly food imports that drain foreign exchange.
- Shortage of industrial raw materials: agro-based industries lack enough raw materials, slowing industrial growth and causing under-utilisation of factories.
- Reduced income and foreign exchange: low exports of cash crops lower farmers' incomes and government revenue, worsening rural poverty and unemployment.
(c) How the problems can be solved
- Provide agricultural credit, subsidies and inputs (improved seeds, fertilizers, machinery) to farmers.
- Encourage mechanised and large-scale commercial farming and reform the land tenure system.
- Build storage, processing and good rural roads, and establish stable markets and price support.
- Provide irrigation, pest and disease control, and extension/education services to raise and stabilise yields.
- Make farming attractive to the young through incentives to reduce rural-urban migration.
Awọn alaye Idahun
(a) Four problems facing agriculture in Nigeria
- Poor and outdated methods: most farming is done on small scattered plots with simple tools (hoes and cutlasses) and little mechanisation, keeping output low.
- Inadequate finance and inputs: shortage of credit, improved seeds, fertilizers and modern machinery limits production and expansion.
- Poor storage, processing and transport: bad rural roads and lack of storage/processing facilities cause heavy post-harvest losses and difficulty in getting produce to market.
- Land tenure problems: the fragmented, inherited land-holding system makes it hard to acquire large blocks of land for commercial farming.
- Unfavourable natural factors: pests, diseases, drought, flooding and declining soil fertility reduce yields, while rural-urban migration causes a shortage of farm labour.
(b) Three effects of these problems on economic development
- Low food production and food insecurity: insufficient food raises prices, causes hunger and forces costly food imports that drain foreign exchange.
- Shortage of industrial raw materials: agro-based industries lack enough raw materials, slowing industrial growth and causing under-utilisation of factories.
- Reduced income and foreign exchange: low exports of cash crops lower farmers' incomes and government revenue, worsening rural poverty and unemployment.
(c) How the problems can be solved
- Provide agricultural credit, subsidies and inputs (improved seeds, fertilizers, machinery) to farmers.
- Encourage mechanised and large-scale commercial farming and reform the land tenure system.
- Build storage, processing and good rural roads, and establish stable markets and price support.
- Provide irrigation, pest and disease control, and extension/education services to raise and stabilise yields.
- Make farming attractive to the young through incentives to reduce rural-urban migration.
Ibeere 6 Ìròyìn
(a) On a sketch map of Nigeria, show and name the
(i) three climatic belts;
(ii) dominant air masses which influence the climate of Nigeria
(b) Outline three ways in which the Sudan savannah vegetation has adapted itself to the climate in Nigeria
(c) In what four ways is natural vegetation of economic importance to man in Nigeria?
(a) Sketch maps of Nigeria
(i) Climatic belts
(ii) Dominant air masses influencing Nigeria
The Tropical Maritime (mT) air mass is moist and originates over the Atlantic Ocean. The Tropical Continental (cT) air mass is dry and dusty and originates over the Sahara Desert. Their boundary is the Inter-Tropical Discontinuity (ITD).
(b) Adaptations of Sudan savannah vegetation to the climate
- Trees have long tap roots which reach underground water during the long dry season.
- Many trees shed their leaves during the dry season in order to reduce water loss through transpiration.
- Trees commonly have small, thorny leaves and thick bark. These reduce transpiration and help the plants withstand heat, drought and bush fires.
(c) Economic importance of natural vegetation in Nigeria
- It provides food, such as fruits, nuts, seeds, leaves and edible roots, for man.
- It supplies grasses and browse which serve as food for livestock and wildlife.
- It supplies raw materials for industries, including timber, rubber, fibres, ropes, paper pulp, gums and medicinal herbs.
- It provides employment and fuelwood through forestry, logging, sawmilling, charcoal production and related activities.
Awọn alaye Idahun
(a) Sketch maps of Nigeria
(i) Climatic belts
(ii) Dominant air masses influencing Nigeria
The Tropical Maritime (mT) air mass is moist and originates over the Atlantic Ocean. The Tropical Continental (cT) air mass is dry and dusty and originates over the Sahara Desert. Their boundary is the Inter-Tropical Discontinuity (ITD).
(b) Adaptations of Sudan savannah vegetation to the climate
- Trees have long tap roots which reach underground water during the long dry season.
- Many trees shed their leaves during the dry season in order to reduce water loss through transpiration.
- Trees commonly have small, thorny leaves and thick bark. These reduce transpiration and help the plants withstand heat, drought and bush fires.
(c) Economic importance of natural vegetation in Nigeria
- It provides food, such as fruits, nuts, seeds, leaves and edible roots, for man.
- It supplies grasses and browse which serve as food for livestock and wildlife.
- It supplies raw materials for industries, including timber, rubber, fibres, ropes, paper pulp, gums and medicinal herbs.
- It provides employment and fuelwood through forestry, logging, sawmilling, charcoal production and related activities.
Ibeere 7 Ìròyìn
(a) What five advantages could be derived when countries trade with one another?
(b) Highlight four factors which influenced the trade between Nigeria and Canada.
(a) Five advantages of countries trading with one another (international trade)
- Access to goods not produced at home: countries obtain raw materials, manufactured goods and services that they cannot produce themselves or produce only at high cost.
- Earning of foreign exchange: exporting goods brings in foreign currency used to pay for imports and to develop the economy.
- Encouragement of specialisation: each country concentrates on producing what it makes best (comparative advantage), raising efficiency and output.
- Wider market and higher income: producers sell to a larger world market, increasing production, employment and national income.
- Promotion of friendship and cooperation: trade fosters good political and cultural relations, and the exchange of ideas and technology between nations.
- Disposal of surplus: countries can sell off surplus produce instead of allowing it to waste.
(b) Four factors that influenced trade between Nigeria and Canada
- Difference in natural resources and products: Nigeria supplies mainly primary products (crude oil, cocoa, agricultural raw materials) while Canada supplies manufactured goods, machinery, wheat and technology, so each needs what the other has.
- Differences in level of industrial and technological development: Canada is highly industrialised and exports manufactured/capital goods, while Nigeria, less industrialised, imports them, encouraging exchange.
- Differences in climate and agriculture: Canada's temperate climate yields wheat and temperate produce, while Nigeria's tropical climate yields cocoa and tropical crops, so the two exchange complementary produce.
- Transport, communication and international agreements: availability of shipping and air links, together with trade agreements and Commonwealth membership, eased the movement of goods and payments between the two countries.
- Demand and purchasing power: the existence of demand and the ability to pay in each country supported the flow of trade.
Awọn alaye Idahun
(a) Five advantages of countries trading with one another (international trade)
- Access to goods not produced at home: countries obtain raw materials, manufactured goods and services that they cannot produce themselves or produce only at high cost.
- Earning of foreign exchange: exporting goods brings in foreign currency used to pay for imports and to develop the economy.
- Encouragement of specialisation: each country concentrates on producing what it makes best (comparative advantage), raising efficiency and output.
- Wider market and higher income: producers sell to a larger world market, increasing production, employment and national income.
- Promotion of friendship and cooperation: trade fosters good political and cultural relations, and the exchange of ideas and technology between nations.
- Disposal of surplus: countries can sell off surplus produce instead of allowing it to waste.
(b) Four factors that influenced trade between Nigeria and Canada
- Difference in natural resources and products: Nigeria supplies mainly primary products (crude oil, cocoa, agricultural raw materials) while Canada supplies manufactured goods, machinery, wheat and technology, so each needs what the other has.
- Differences in level of industrial and technological development: Canada is highly industrialised and exports manufactured/capital goods, while Nigeria, less industrialised, imports them, encouraging exchange.
- Differences in climate and agriculture: Canada's temperate climate yields wheat and temperate produce, while Nigeria's tropical climate yields cocoa and tropical crops, so the two exchange complementary produce.
- Transport, communication and international agreements: availability of shipping and air links, together with trade agreements and Commonwealth membership, eased the movement of goods and payments between the two countries.
- Demand and purchasing power: the existence of demand and the ability to pay in each country supported the flow of trade.
Ibeere 8 Ìròyìn
(a) On an outline map of Nigeria, locate and name:
(i) the rail lines linking Lagos to Nguru
(ii) the railway line linking Port-Harcourt to Kaduna
(b) Explain any four ways in which rail contributed to the economic development of Nigeria
(c) Highlight any three problems of rail transportation in Nigeria
(a) Outline map of Nigeria showing the railway lines
- (i) The Western line linking Lagos to Nguru: draw the line from Lagos running north through Ibadan - Oyo - Ogbomosho - Ilorin - Minna - Kaduna - Zaria - Kano and on to Nguru in the far north.
- (ii) The Eastern line linking Port Harcourt to Kaduna: draw the line from Port Harcourt running north through Aba - Enugu - Makurdi - Kafanchan to Kaduna (where it joins the western line). Label the towns and the two coastal terminals (Lagos and Port Harcourt).
(b) Four ways rail contributed to the economic development of Nigeria
- Movement of bulky goods cheaply: the railway carries heavy, bulky produce (groundnuts, cotton, tin, coal, cocoa) over long distances at low cost from the interior to the ports for export.
- Opening up of the interior: it linked remote inland areas to the coast, encouraging trade, farming and the growth of towns along the line (Kaduna, Kafanchan).
- Promotion of mining and industry: it enabled the transport of coal from Enugu, tin from Jos and raw materials to factories, boosting mining and manufacturing.
- Employment and passenger movement: it provides jobs and cheap mass movement of people to work, markets and other regions, aiding labour mobility and national integration.
(c) Three problems of rail transportation in Nigeria
- Old and poorly maintained equipment: ageing tracks, coaches and locomotives with a narrow-gauge system cause frequent breakdowns and delays.
- Limited network: the few lines do not reach many parts of the country, and there is little inter-connection, so rail cannot serve all areas.
- Slow speed and inflexibility: trains are slow and can only move between fixed stations, requiring other transport to reach final destinations.
- Inadequate funding and competition from road transport further weaken the railways.
Awọn alaye Idahun
(a) Outline map of Nigeria showing the railway lines
- (i) The Western line linking Lagos to Nguru: draw the line from Lagos running north through Ibadan - Oyo - Ogbomosho - Ilorin - Minna - Kaduna - Zaria - Kano and on to Nguru in the far north.
- (ii) The Eastern line linking Port Harcourt to Kaduna: draw the line from Port Harcourt running north through Aba - Enugu - Makurdi - Kafanchan to Kaduna (where it joins the western line). Label the towns and the two coastal terminals (Lagos and Port Harcourt).
(b) Four ways rail contributed to the economic development of Nigeria
- Movement of bulky goods cheaply: the railway carries heavy, bulky produce (groundnuts, cotton, tin, coal, cocoa) over long distances at low cost from the interior to the ports for export.
- Opening up of the interior: it linked remote inland areas to the coast, encouraging trade, farming and the growth of towns along the line (Kaduna, Kafanchan).
- Promotion of mining and industry: it enabled the transport of coal from Enugu, tin from Jos and raw materials to factories, boosting mining and manufacturing.
- Employment and passenger movement: it provides jobs and cheap mass movement of people to work, markets and other regions, aiding labour mobility and national integration.
(c) Three problems of rail transportation in Nigeria
- Old and poorly maintained equipment: ageing tracks, coaches and locomotives with a narrow-gauge system cause frequent breakdowns and delays.
- Limited network: the few lines do not reach many parts of the country, and there is little inter-connection, so rail cannot serve all areas.
- Slow speed and inflexibility: trains are slow and can only move between fixed stations, requiring other transport to reach final destinations.
- Inadequate funding and competition from road transport further weaken the railways.
Ibeere 9 Ìròyìn
With the aid of diagrams, describe the characteristic and mode of formation of any two of the following:
(a) Rock pedestal (b) Yardang (c) Mesa
These are landforms produced mainly by wind action (deflation and abrasion) in hot desert regions. Two are described below with the aid of labelled diagrams.
(a) Rock pedestal (mushroom rock / gour)
Diagram: a rock with a broad, rounded top standing on a narrow, undercut stem, resembling a mushroom, with wind arrows striking the base.
- Characteristics: it has a wide upper part resting on a thin, narrow base (stem), giving a mushroom or table shape. The neck is deeply undercut and the whole feature stands isolated on the desert floor.
- Mode of formation: it develops where a mass of rock has harder rock on top and softer rock below. Wind carries sand grains that are heaviest and most concentrated near the ground, so abrasion (sand-blasting) is strongest at the base. The lower, softer part is worn away faster than the top, undercutting the rock until it stands on a narrow pedestal shaped like a mushroom.
(b) Yardang
Diagram: parallel ridges and grooves running in the direction of the prevailing wind, with wind arrows aligned along the furrows.
- Characteristics: it consists of long, steep-sided ridges of hard rock separated by grooves or furrows of softer rock. The ridges are aligned parallel to the prevailing wind and may be several metres high and long.
- Mode of formation: it forms where bands of hard and soft rock lie alternately and are aligned in the direction of the wind. Wind-driven sand abrades and scours out the softer bands, cutting them into deep grooves, while the more resistant hard bands are left standing up as ridges. Continued deflation and abrasion deepen the furrows and sharpen the ridges into yardangs.
Awọn alaye Idahun
These are landforms produced mainly by wind action (deflation and abrasion) in hot desert regions. Two are described below with the aid of labelled diagrams.
(a) Rock pedestal (mushroom rock / gour)
Diagram: a rock with a broad, rounded top standing on a narrow, undercut stem, resembling a mushroom, with wind arrows striking the base.
- Characteristics: it has a wide upper part resting on a thin, narrow base (stem), giving a mushroom or table shape. The neck is deeply undercut and the whole feature stands isolated on the desert floor.
- Mode of formation: it develops where a mass of rock has harder rock on top and softer rock below. Wind carries sand grains that are heaviest and most concentrated near the ground, so abrasion (sand-blasting) is strongest at the base. The lower, softer part is worn away faster than the top, undercutting the rock until it stands on a narrow pedestal shaped like a mushroom.
(b) Yardang
Diagram: parallel ridges and grooves running in the direction of the prevailing wind, with wind arrows aligned along the furrows.
- Characteristics: it consists of long, steep-sided ridges of hard rock separated by grooves or furrows of softer rock. The ridges are aligned parallel to the prevailing wind and may be several metres high and long.
- Mode of formation: it forms where bands of hard and soft rock lie alternately and are aligned in the direction of the wind. Wind-driven sand abrades and scours out the softer bands, cutting them into deep grooves, while the more resistant hard bands are left standing up as ridges. Continued deflation and abrasion deepen the furrows and sharpen the ridges into yardangs.
Ibeere 10 Ìròyìn
(a) Using specific examples, identify any three classes of settlements based on their functions
(b) Describe the characteristics of any two of the settlement types identified in (a) above.
(a) Three classes of settlement based on function
Settlements can be grouped by the dominant activity or service they provide:
- (i) Administrative/capital settlement - its main function is government and administration. Example: Abuja (also Washington D.C.).
- (ii) Industrial/manufacturing settlement - dominated by factories and manufacturing. Example: Aba or Kano (also the mining town of Jos).
- (iii) Commercial/market settlement - centred on trade, markets and business. Example: Onitsha (also Lagos as a great commercial centre).
(Other acceptable classes: port/harbour settlement such as Port Harcourt; religious settlement such as Mecca; educational settlement such as a university town; tourist/resort settlement; agricultural/rural settlement.)
(b) Characteristics of two settlement types
1. Administrative settlement (e.g. Abuja)
- It houses government offices, ministries, the seat of the executive, legislature and judiciary, and embassies.
- It is usually well planned with good roads, modern buildings and public utilities.
- Its working population is dominated by civil servants and administrators, and it attracts related services (hotels, banks).
2. Commercial/market settlement (e.g. Onitsha)
- It is dominated by large markets, shops, warehouses and financial institutions.
- It has a high daytime population and heavy traffic of buyers, sellers and goods, often at a route or river junction (nodal point).
- Its people are mainly engaged in buying, selling and transport services, and it usually has a dense, congested central business area.
Awọn alaye Idahun
(a) Three classes of settlement based on function
Settlements can be grouped by the dominant activity or service they provide:
- (i) Administrative/capital settlement - its main function is government and administration. Example: Abuja (also Washington D.C.).
- (ii) Industrial/manufacturing settlement - dominated by factories and manufacturing. Example: Aba or Kano (also the mining town of Jos).
- (iii) Commercial/market settlement - centred on trade, markets and business. Example: Onitsha (also Lagos as a great commercial centre).
(Other acceptable classes: port/harbour settlement such as Port Harcourt; religious settlement such as Mecca; educational settlement such as a university town; tourist/resort settlement; agricultural/rural settlement.)
(b) Characteristics of two settlement types
1. Administrative settlement (e.g. Abuja)
- It houses government offices, ministries, the seat of the executive, legislature and judiciary, and embassies.
- It is usually well planned with good roads, modern buildings and public utilities.
- Its working population is dominated by civil servants and administrators, and it attracts related services (hotels, banks).
2. Commercial/market settlement (e.g. Onitsha)
- It is dominated by large markets, shops, warehouses and financial institutions.
- It has a high daytime population and heavy traffic of buyers, sellers and goods, often at a route or river junction (nodal point).
- Its people are mainly engaged in buying, selling and transport services, and it usually has a dense, congested central business area.
Ibeere 11 Ìròyìn
Compare and contrast the eastern scarplands and western highlands under the following headings;
(a) Relief (b) people and population (c) settlement pattern (d) Agriculture
Comparison of the Eastern Scarplands and the Western Highlands (Nigeria)
(a) Relief
| Eastern Scarplands | Western Highlands |
|---|---|
| A series of cuestas and scarps of sedimentary rock (e.g. Udi/Enugu and Nsukka escarpments, Obudu and Mambilla plateaux). Steep scarp faces with gentler dip slopes. | An upland of hard, ancient crystalline (Basement Complex) rock with rounded hills, inselbergs and dissected plateaux (Yoruba/Western uplands). |
| Prone to severe gully erosion on the soft sedimentary rocks. | More resistant rocks; erosion is less severe, giving bold rocky outcrops. |
(b) People and population
| Eastern Scarplands | Western Highlands |
|---|---|
| Densely populated, inhabited mainly by the Igbo and related groups; very high rural population pressure. | Also well populated, inhabited mainly by the Yoruba; among the most urbanised areas of Nigeria. |
(c) Settlement pattern
| Eastern Scarplands | Western Highlands |
|---|---|
| Mainly dispersed/scattered rural settlements of small compounds spread over the land, with towns such as Enugu, Nsukka and Abakaliki. | Mainly nucleated/clustered settlements forming large traditional towns such as Ibadan, Abeokuta, Ife and Oyo. |
(d) Agriculture
| Eastern Scarplands | Western Highlands |
|---|---|
| Intensive small-scale farming of yam, cassava, oil palm, rice and vegetables on fragmented plots, hampered by erosion. | Farming of cocoa (chief cash crop), kola, oil palm, food crops (yam, maize, cassava), often on larger, more commercial holdings. |
Awọn alaye Idahun
Comparison of the Eastern Scarplands and the Western Highlands (Nigeria)
(a) Relief
| Eastern Scarplands | Western Highlands |
|---|---|
| A series of cuestas and scarps of sedimentary rock (e.g. Udi/Enugu and Nsukka escarpments, Obudu and Mambilla plateaux). Steep scarp faces with gentler dip slopes. | An upland of hard, ancient crystalline (Basement Complex) rock with rounded hills, inselbergs and dissected plateaux (Yoruba/Western uplands). |
| Prone to severe gully erosion on the soft sedimentary rocks. | More resistant rocks; erosion is less severe, giving bold rocky outcrops. |
(b) People and population
| Eastern Scarplands | Western Highlands |
|---|---|
| Densely populated, inhabited mainly by the Igbo and related groups; very high rural population pressure. | Also well populated, inhabited mainly by the Yoruba; among the most urbanised areas of Nigeria. |
(c) Settlement pattern
| Eastern Scarplands | Western Highlands |
|---|---|
| Mainly dispersed/scattered rural settlements of small compounds spread over the land, with towns such as Enugu, Nsukka and Abakaliki. | Mainly nucleated/clustered settlements forming large traditional towns such as Ibadan, Abeokuta, Ife and Oyo. |
(d) Agriculture
| Eastern Scarplands | Western Highlands |
|---|---|
| Intensive small-scale farming of yam, cassava, oil palm, rice and vegetables on fragmented plots, hampered by erosion. | Farming of cocoa (chief cash crop), kola, oil palm, food crops (yam, maize, cassava), often on larger, more commercial holdings. |
Ibeere 12 Ìròyìn
(a) Explain the following terms:
(i) Over-population;
(ii) Migration
(b) Describe any three factors which encourage the occurrence of each term in (a) above within a population group
(a) Explanation of the terms
- (i) Over-population: a situation in which the number of people living in an area is greater than the available resources can adequately support. The population outstrips the resources (food, land, jobs, services), so the standard of living falls, and there is unemployment, poverty and pressure on facilities.
- (ii) Migration: the movement of people from one place (or country) to another with the intention of settling, temporarily or permanently. It involves leaving one area (out-migration/emigration) and entering another (in-migration/immigration), and may be internal (within a country) or international.
(b) Three factors encouraging each
Factors encouraging over-population
- High birth rate arising from early marriage, polygamy and the desire for large families.
- Falling death rate due to improved medical care, better sanitation and food supply, so more people survive.
- Heavy in-migration of people into an area in search of work and better living conditions, swelling numbers beyond available resources.
- Limited or declining resources (poor soils, few industries) so that even a modest population becomes too large for the area.
Factors encouraging migration
- Economic factors: search for employment, higher wages and better business opportunities pull people to towns and richer areas; poverty and joblessness push them away from poorer areas.
- Social factors: desire for better education, health care and social amenities, and family reunion.
- Political and environmental factors: wars, insecurity, persecution, drought, flooding or famine force people to move to safer, more productive areas.
Awọn alaye Idahun
(a) Explanation of the terms
- (i) Over-population: a situation in which the number of people living in an area is greater than the available resources can adequately support. The population outstrips the resources (food, land, jobs, services), so the standard of living falls, and there is unemployment, poverty and pressure on facilities.
- (ii) Migration: the movement of people from one place (or country) to another with the intention of settling, temporarily or permanently. It involves leaving one area (out-migration/emigration) and entering another (in-migration/immigration), and may be internal (within a country) or international.
(b) Three factors encouraging each
Factors encouraging over-population
- High birth rate arising from early marriage, polygamy and the desire for large families.
- Falling death rate due to improved medical care, better sanitation and food supply, so more people survive.
- Heavy in-migration of people into an area in search of work and better living conditions, swelling numbers beyond available resources.
- Limited or declining resources (poor soils, few industries) so that even a modest population becomes too large for the area.
Factors encouraging migration
- Economic factors: search for employment, higher wages and better business opportunities pull people to towns and richer areas; poverty and joblessness push them away from poorer areas.
- Social factors: desire for better education, health care and social amenities, and family reunion.
- Political and environmental factors: wars, insecurity, persecution, drought, flooding or famine force people to move to safer, more productive areas.
Ibeere 13 Ìròyìn
Use the climatic data below to answer the questions that follow;
| Month | jan | Feb | Mar | Apr | May | June | July | Aug | Sept | Oct | Nov | Dec |
| Temp(ºC) | -19 | -17 | -8 | 2 | 10 | 17 | 18 | 18 | 11 | 4 | -5 | -13 |
| Precipitation (mm) | 22 | 17 | 29 | 35 | 50 | 78 | 78 | 55 | 55 | 35 | 27 | 22 |
(a) Calculate the
(i) mean annual temperature
(ii) annual range of temperature
(iii) total annual temperature
(b) Briefly describe the distribution of the precipitation for the station
(c) Identify the type of natural vegetation that could be associated with the climate data given above. Give two reasons for your answer
| Month | J | F | M | A | M | J | J | A | S | O | N | D |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Temp (°C) | -19 | -17 | -8 | 2 | 10 | 17 | 18 | 18 | 11 | 4 | -5 | -13 |
| Precip (mm) | 22 | 17 | 29 | 35 | 50 | 78 | 78 | 55 | 55 | 35 | 27 | 22 |
(a)(i) Mean annual temperature
Sum of monthly temperatures: \((-19)+(-17)+(-8)+2+10+17+18+18+11+4+(-5)+(-13) = 18\). \[\text{Mean} = \frac{18}{12} = 1.5^{\circ}\text{C}.\]
(a)(ii) Annual range of temperature
Range = highest − lowest = \(18^{\circ}\text{C} - (-19^{\circ}\text{C}) = 37^{\circ}\text{C}\).
(a)(iii) Total annual temperature
The sum of the twelve monthly temperatures = 18°C.
(b) Distribution of precipitation
Precipitation falls in every month (no dry month), giving a total of 503 mm. The maximum comes in the warm summer months of June and July (78 mm each) and the minimum in February (17 mm). Thus the wettest season is the short warm summer and the driest season is the long cold winter, a clear summer-maximum regime with a moderate annual total.
(c) Type of natural vegetation and reasons
The vegetation associated with this data is coniferous (boreal) forest, the Taiga.
- The winters are long and severely cold (five months below freezing, down to −19°C), and only needle-leaf coniferous evergreens (pine, fir, spruce) can withstand such cold and the short growing season.
- The summers are short but warm (June to August, 17 to 18°C) with a summer rainfall maximum, giving just enough warmth and moisture for these hardy conifers, whose conical shape and needle leaves shed snow and reduce water loss.
Awọn alaye Idahun
| Month | J | F | M | A | M | J | J | A | S | O | N | D |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Temp (°C) | -19 | -17 | -8 | 2 | 10 | 17 | 18 | 18 | 11 | 4 | -5 | -13 |
| Precip (mm) | 22 | 17 | 29 | 35 | 50 | 78 | 78 | 55 | 55 | 35 | 27 | 22 |
(a)(i) Mean annual temperature
Sum of monthly temperatures: \((-19)+(-17)+(-8)+2+10+17+18+18+11+4+(-5)+(-13) = 18\). \[\text{Mean} = \frac{18}{12} = 1.5^{\circ}\text{C}.\]
(a)(ii) Annual range of temperature
Range = highest − lowest = \(18^{\circ}\text{C} - (-19^{\circ}\text{C}) = 37^{\circ}\text{C}\).
(a)(iii) Total annual temperature
The sum of the twelve monthly temperatures = 18°C.
(b) Distribution of precipitation
Precipitation falls in every month (no dry month), giving a total of 503 mm. The maximum comes in the warm summer months of June and July (78 mm each) and the minimum in February (17 mm). Thus the wettest season is the short warm summer and the driest season is the long cold winter, a clear summer-maximum regime with a moderate annual total.
(c) Type of natural vegetation and reasons
The vegetation associated with this data is coniferous (boreal) forest, the Taiga.
- The winters are long and severely cold (five months below freezing, down to −19°C), and only needle-leaf coniferous evergreens (pine, fir, spruce) can withstand such cold and the short growing season.
- The summers are short but warm (June to August, 17 to 18°C) with a summer rainfall maximum, giving just enough warmth and moisture for these hardy conifers, whose conical shape and needle leaves shed snow and reduce water loss.
Ibeere 14 Ìròyìn
(a) Draw an outline map of Africa and on it locate:
(i) Latitude 0° and longitude 20°E
(ii) one named ocean current along the Western coast and one along the Eastern coast
(iii) two named deserts (one in the North and the other in the South)
(b) Give three reasons for the presence of deserts in the north of Africa.
(a) Outline map of Africa showing the required features
Key: The horizontal line is Latitude 0° (the Equator), while the vertical line is Longitude 20°E. Their intersection is in the Congo Basin area. The Sahara Desert is shown in the north and the Kalahari Desert in the south. The Canary Current is shown along the western coast and the Mozambique Current along the eastern coast.
(b) Reasons for the presence of deserts in North Africa
- Cold ocean current: The cold Canary Current along the north-western coast cools the air, reducing evaporation and rainfall. It commonly produces fog rather than effective rain.
- Dry north-east trade winds: The prevailing north-east trade winds blow from the dry continental interior and therefore carry little moisture.
- Continentality: Large parts of North Africa are far from the sea. Moisture-bearing winds lose much of their moisture before reaching the interior, resulting in very low rainfall.
Awọn alaye Idahun
(a) Outline map of Africa showing the required features
Key: The horizontal line is Latitude 0° (the Equator), while the vertical line is Longitude 20°E. Their intersection is in the Congo Basin area. The Sahara Desert is shown in the north and the Kalahari Desert in the south. The Canary Current is shown along the western coast and the Mozambique Current along the eastern coast.
(b) Reasons for the presence of deserts in North Africa
- Cold ocean current: The cold Canary Current along the north-western coast cools the air, reducing evaporation and rainfall. It commonly produces fog rather than effective rain.
- Dry north-east trade winds: The prevailing north-east trade winds blow from the dry continental interior and therefore carry little moisture.
- Continentality: Large parts of North Africa are far from the sea. Moisture-bearing winds lose much of their moisture before reaching the interior, resulting in very low rainfall.
Ibeere 15 Ìròyìn
(a) What five benefits does Nigeria derive from being a member of the ECOWAS?
(b) Outline four problems facing the community
(a) Five benefits Nigeria derives from being a member of ECOWAS
(ECOWAS = Economic Community of West African States, formed in 1975.)
- Wider market for trade: the removal of trade barriers and tariffs among members gives Nigerian goods a large regional market, boosting exports and industry.
- Free movement of people: citizens can travel, live and work in member states without visas, aiding employment, labour supply and business.
- Economic cooperation and development: joint projects in transport, energy, telecommunications and agriculture speed up development that a single country could not achieve alone.
- Regional peace and security: the community (through bodies such as ECOMOG) helps to keep peace, settle conflicts and maintain stability in the sub-region, in which Nigeria plays a leading role.
- Bargaining strength and cooperation: acting as a bloc gives members greater bargaining power in world trade and attracts foreign investment; there is also exchange of skills, technology and culture.
- Common currency and payment arrangements ease trade and travel.
(b) Four problems facing the community
- Differences in official language and colonial background (English, French, Portuguese) hinder communication and cooperation.
- Similar (competing) economies: most members produce the same primary products and so compete rather than complement one another, limiting intra-regional trade.
- Poor transport and communication links between member states raise the cost of movement of goods and people.
- Political instability and insecurity (coups, wars, insurgency) and border disputes disrupt cooperation.
- Inadequate funding and unequal levels of development, smuggling, and different currencies also weaken the community.
Awọn alaye Idahun
(a) Five benefits Nigeria derives from being a member of ECOWAS
(ECOWAS = Economic Community of West African States, formed in 1975.)
- Wider market for trade: the removal of trade barriers and tariffs among members gives Nigerian goods a large regional market, boosting exports and industry.
- Free movement of people: citizens can travel, live and work in member states without visas, aiding employment, labour supply and business.
- Economic cooperation and development: joint projects in transport, energy, telecommunications and agriculture speed up development that a single country could not achieve alone.
- Regional peace and security: the community (through bodies such as ECOMOG) helps to keep peace, settle conflicts and maintain stability in the sub-region, in which Nigeria plays a leading role.
- Bargaining strength and cooperation: acting as a bloc gives members greater bargaining power in world trade and attracts foreign investment; there is also exchange of skills, technology and culture.
- Common currency and payment arrangements ease trade and travel.
(b) Four problems facing the community
- Differences in official language and colonial background (English, French, Portuguese) hinder communication and cooperation.
- Similar (competing) economies: most members produce the same primary products and so compete rather than complement one another, limiting intra-regional trade.
- Poor transport and communication links between member states raise the cost of movement of goods and people.
- Political instability and insecurity (coups, wars, insurgency) and border disputes disrupt cooperation.
- Inadequate funding and unequal levels of development, smuggling, and different currencies also weaken the community.
Ibeere 16 Ìròyìn
Describe the practice of pastoral nomadism in EastAfrica under the following headings:
(a) Areas and people involved; (b) Methods (c) Problems (d) Economic importance
Pastoral nomadism in East Africa
(a) Areas and people involved
Pastoral nomadism is practised in the drier savanna and semi-desert areas of East Africa where rainfall is low and unreliable. These include the plains of Kenya, Tanzania, Uganda, Somalia and Ethiopia. The main peoples involved are the Masai (of Kenya and Tanzania), the Turkana, Karamojong, Somali and Fulani-related Nilotic groups. They keep herds of cattle, goats, sheep and camels.
(b) Methods
- The herdsmen move (migrate) from place to place with their animals in search of pasture and water, following the seasonal rains.
- Grazing is on natural, unimproved pasture; no fodder is cultivated and animals feed on communal open range.
- Herd sizes are kept as large as possible because cattle are a measure of wealth and social status rather than commercial output.
- They live in temporary settlements (e.g. the Masai manyatta) that are abandoned when the herd moves on.
(c) Problems
- Shortage of water and pasture during the long dry season, leading to the death of animals.
- Diseases and pests such as rinderpest, nagana (from the tsetse fly) and tick-borne diseases.
- Overgrazing of communal land, causing soil erosion and desertification.
- Poor quality stock of low milk and meat yield, and conflicts with settled farmers over land, plus difficulty of veterinary and marketing services because of constant movement.
(d) Economic importance
- It provides milk, meat, hides and skins for the people's food and for sale.
- It supports the leather and meat-processing industries and earns some income and foreign exchange.
- It makes productive use of marginal semi-arid land that is unsuitable for crop farming, and provides a livelihood and employment for the pastoral communities.
Awọn alaye Idahun
Pastoral nomadism in East Africa
(a) Areas and people involved
Pastoral nomadism is practised in the drier savanna and semi-desert areas of East Africa where rainfall is low and unreliable. These include the plains of Kenya, Tanzania, Uganda, Somalia and Ethiopia. The main peoples involved are the Masai (of Kenya and Tanzania), the Turkana, Karamojong, Somali and Fulani-related Nilotic groups. They keep herds of cattle, goats, sheep and camels.
(b) Methods
- The herdsmen move (migrate) from place to place with their animals in search of pasture and water, following the seasonal rains.
- Grazing is on natural, unimproved pasture; no fodder is cultivated and animals feed on communal open range.
- Herd sizes are kept as large as possible because cattle are a measure of wealth and social status rather than commercial output.
- They live in temporary settlements (e.g. the Masai manyatta) that are abandoned when the herd moves on.
(c) Problems
- Shortage of water and pasture during the long dry season, leading to the death of animals.
- Diseases and pests such as rinderpest, nagana (from the tsetse fly) and tick-borne diseases.
- Overgrazing of communal land, causing soil erosion and desertification.
- Poor quality stock of low milk and meat yield, and conflicts with settled farmers over land, plus difficulty of veterinary and marketing services because of constant movement.
(d) Economic importance
- It provides milk, meat, hides and skins for the people's food and for sale.
- It supports the leather and meat-processing industries and earns some income and foreign exchange.
- It makes productive use of marginal semi-arid land that is unsuitable for crop farming, and provides a livelihood and employment for the pastoral communities.
Ibeere 17 Ìròyìn
(a) On an outline map of Africa, locate and name
(i) two areas important for fruit farming
(ii) two areas important for irrigation agriculture
(iii) one important town in each area
(b) What three problems face the cultivation of fruits in the area selected in (b) above?
(a) Outline map of Africa
- (i) Two areas important for fruit farming: the Mediterranean coastlands of North Africa (Morocco, Algeria, Tunisia - citrus, grapes, olives) and the south-western Cape region of South Africa (grapes, citrus, deciduous fruits). (The Nile Delta and the Kenya highlands are also acceptable.)
- (ii) Two areas important for irrigation agriculture: the Nile Valley and Delta in Egypt/Sudan and the Gezira scheme between the Blue and White Nile (Sudan). (The inland Niger delta in Mali is also acceptable.)
- (iii) One important town in each area: for fruit farming - Cape Town (or Casablanca); for irrigation - Cairo (or Wad Medani for the Gezira).
Label the coastline, the Nile, and a key distinguishing fruit-farming from irrigation areas.
(b) Three problems facing the cultivation of fruits in the area selected (e.g. the Cape/Mediterranean fruit belt)
- Water shortage and summer drought: the dry, hot summers mean fruit trees need costly irrigation, and water can be scarce.
- Pests and diseases: insects, fungi and plant diseases attack the fruits, lowering yield and quality unless expensive spraying is done.
- Perishability, storage and transport problems: fruits spoil quickly, so poor storage, refrigeration and transport lead to heavy losses before they reach distant markets.
- Marketing and price fluctuations: competition and unstable world prices reduce farmers' incomes; frost and strong winds can also damage crops.
Awọn alaye Idahun
(a) Outline map of Africa
- (i) Two areas important for fruit farming: the Mediterranean coastlands of North Africa (Morocco, Algeria, Tunisia - citrus, grapes, olives) and the south-western Cape region of South Africa (grapes, citrus, deciduous fruits). (The Nile Delta and the Kenya highlands are also acceptable.)
- (ii) Two areas important for irrigation agriculture: the Nile Valley and Delta in Egypt/Sudan and the Gezira scheme between the Blue and White Nile (Sudan). (The inland Niger delta in Mali is also acceptable.)
- (iii) One important town in each area: for fruit farming - Cape Town (or Casablanca); for irrigation - Cairo (or Wad Medani for the Gezira).
Label the coastline, the Nile, and a key distinguishing fruit-farming from irrigation areas.
(b) Three problems facing the cultivation of fruits in the area selected (e.g. the Cape/Mediterranean fruit belt)
- Water shortage and summer drought: the dry, hot summers mean fruit trees need costly irrigation, and water can be scarce.
- Pests and diseases: insects, fungi and plant diseases attack the fruits, lowering yield and quality unless expensive spraying is done.
- Perishability, storage and transport problems: fruits spoil quickly, so poor storage, refrigeration and transport lead to heavy losses before they reach distant markets.
- Marketing and price fluctuations: competition and unstable world prices reduce farmers' incomes; frost and strong winds can also damage crops.
Ibeere 18 Ìròyìn
(a) On an outline map of Africa, locate and name, outside Nigeria,
(i) two areas important for the mining of gold
(ii) two areas important for the mining of petroleum;
(iii) two areas important for the mining of copper
(iv) one town important for the mining of each of the minerals
(b) State any four contributions of minerals to the economy of African countries
(c) Identify any three problems associated with mining in Africa
(a) Outline map of Africa (areas outside Nigeria)
- (i) Two areas important for gold mining: the Witwatersrand (Johannesburg area) of South Africa and the Ashanti/Obuasi area of Ghana.
- (ii) Two areas important for petroleum: Libya (Sirte Basin) and Algeria (Hassi Messaoud, Saharan fields); Angola (Cabinda) is also acceptable.
- (iii) Two areas important for copper: the Copperbelt of Zambia and the Katanga (Shaba) region of the Democratic Republic of Congo.
- (iv) One important mining town for each mineral: gold - Johannesburg (or Obuasi); petroleum - Hassi Messaoud (or a Libyan oil terminal); copper - Kitwe/Ndola (or Lubumbashi).
(b) Four contributions of minerals to the economy of African countries
- Foreign exchange earnings: export of minerals (gold, oil, copper) brings in large amounts of foreign currency.
- Government revenue: royalties, taxes and profits from mining fund national development.
- Employment: mining and related industries provide jobs and raise incomes.
- Industrial raw materials and energy: minerals feed local industries and petroleum supplies power for the economy.
- Infrastructural development: mining areas attract roads, railways, electricity and new towns.
(c) Three problems associated with mining in Africa
- Environmental damage: mining causes land degradation, deforestation, pollution of water and air, and abandoned pits and heaps.
- Over-dependence on a few minerals: economies tied to one or two minerals suffer badly when world prices fall (price fluctuation).
- Shortage of capital and skilled labour/technology: heavy investment and expertise are needed, and many countries rely on foreign firms that repatriate profits.
- Exhaustion of deposits, poor working conditions and accidents, and displacement of communities are further problems.
Awọn alaye Idahun
(a) Outline map of Africa (areas outside Nigeria)
- (i) Two areas important for gold mining: the Witwatersrand (Johannesburg area) of South Africa and the Ashanti/Obuasi area of Ghana.
- (ii) Two areas important for petroleum: Libya (Sirte Basin) and Algeria (Hassi Messaoud, Saharan fields); Angola (Cabinda) is also acceptable.
- (iii) Two areas important for copper: the Copperbelt of Zambia and the Katanga (Shaba) region of the Democratic Republic of Congo.
- (iv) One important mining town for each mineral: gold - Johannesburg (or Obuasi); petroleum - Hassi Messaoud (or a Libyan oil terminal); copper - Kitwe/Ndola (or Lubumbashi).
(b) Four contributions of minerals to the economy of African countries
- Foreign exchange earnings: export of minerals (gold, oil, copper) brings in large amounts of foreign currency.
- Government revenue: royalties, taxes and profits from mining fund national development.
- Employment: mining and related industries provide jobs and raise incomes.
- Industrial raw materials and energy: minerals feed local industries and petroleum supplies power for the economy.
- Infrastructural development: mining areas attract roads, railways, electricity and new towns.
(c) Three problems associated with mining in Africa
- Environmental damage: mining causes land degradation, deforestation, pollution of water and air, and abandoned pits and heaps.
- Over-dependence on a few minerals: economies tied to one or two minerals suffer badly when world prices fall (price fluctuation).
- Shortage of capital and skilled labour/technology: heavy investment and expertise are needed, and many countries rely on foreign firms that repatriate profits.
- Exhaustion of deposits, poor working conditions and accidents, and displacement of communities are further problems.
Ibeere 19 Ìròyìn
Write a geographical account of the Chad basin under the following headings:
(a) Relief and drainage
(b)Agriculture
(c) Problems of development
Geographical Account of the Chad Basin
(a) Relief and drainage
- The Chad Basin is a broad, low-lying inland depression in north-eastern Nigeria, extending into Niger, Chad and Cameroon. Much of the Nigerian part is a gently undulating plain, generally about 200 to 400 m above sea level, composed mainly of sedimentary sands, clays and alluvial deposits.
- Its surface includes sandy plains, old sand dunes, clay flats known as firki, and low flood plains. The land slopes gently towards Lake Chad.
- Drainage is internal: rivers flow towards Lake Chad rather than to the Atlantic Ocean. Important rivers include the Hadejia and Jama'are, which combine to form the Komadugu Yobe, as well as the Yedseram and Ngadda rivers.
- Many streams are seasonal. They carry much water during the rainy season but have little or no flow in the dry season. Lake Chad is shallow and its area has greatly reduced as a result of drought, evaporation and increased use of river water.
(b) Agriculture
- Agriculture is the major occupation. Rain-fed farming is practised during the short rainy season, while flood-recession farming and irrigation are practised along river valleys and around Lake Chad.
- Food crops include millet, sorghum, maize, rice, cowpea, beans, wheat and vegetables such as onions, tomatoes and pepper. Groundnut is an important cash crop.
- Irrigation farming, including the South Chad Irrigation Project, enables the cultivation of rice, wheat and vegetables during the dry season.
- Livestock rearing is important. Cattle, sheep, goats and camels graze on the natural grasslands, while fishing is carried out in Lake Chad and in the rivers. Agricultural products include fish, beef, milk, hides and skins.
(c) Problems of development
- Drought and unreliable rainfall: Low and irregular rainfall causes crop failure, shortage of water and poor pasture.
- Desert encroachment: The Sahara is advancing southwards, while wind erosion and overgrazing remove vegetation and expose the soil.
- Shrinkage of Lake Chad: This reduces water available for fishing, irrigation, transport and livestock.
- Poor soils: Many areas have sandy, infertile or saline soils, while some low-lying areas are liable to flooding.
- Inadequate capital and technology: Farmers have limited access to modern irrigation equipment, improved seeds, storage facilities and credit.
- Remoteness and poor transport: The basin is far from major markets and ports; poor roads increase the cost of moving farm produce.
- Insecurity and inadequate social amenities: Conflict, sparse settlement, limited health facilities and low educational levels discourage investment.
Awọn alaye Idahun
Geographical Account of the Chad Basin
(a) Relief and drainage
- The Chad Basin is a broad, low-lying inland depression in north-eastern Nigeria, extending into Niger, Chad and Cameroon. Much of the Nigerian part is a gently undulating plain, generally about 200 to 400 m above sea level, composed mainly of sedimentary sands, clays and alluvial deposits.
- Its surface includes sandy plains, old sand dunes, clay flats known as firki, and low flood plains. The land slopes gently towards Lake Chad.
- Drainage is internal: rivers flow towards Lake Chad rather than to the Atlantic Ocean. Important rivers include the Hadejia and Jama'are, which combine to form the Komadugu Yobe, as well as the Yedseram and Ngadda rivers.
- Many streams are seasonal. They carry much water during the rainy season but have little or no flow in the dry season. Lake Chad is shallow and its area has greatly reduced as a result of drought, evaporation and increased use of river water.
(b) Agriculture
- Agriculture is the major occupation. Rain-fed farming is practised during the short rainy season, while flood-recession farming and irrigation are practised along river valleys and around Lake Chad.
- Food crops include millet, sorghum, maize, rice, cowpea, beans, wheat and vegetables such as onions, tomatoes and pepper. Groundnut is an important cash crop.
- Irrigation farming, including the South Chad Irrigation Project, enables the cultivation of rice, wheat and vegetables during the dry season.
- Livestock rearing is important. Cattle, sheep, goats and camels graze on the natural grasslands, while fishing is carried out in Lake Chad and in the rivers. Agricultural products include fish, beef, milk, hides and skins.
(c) Problems of development
- Drought and unreliable rainfall: Low and irregular rainfall causes crop failure, shortage of water and poor pasture.
- Desert encroachment: The Sahara is advancing southwards, while wind erosion and overgrazing remove vegetation and expose the soil.
- Shrinkage of Lake Chad: This reduces water available for fishing, irrigation, transport and livestock.
- Poor soils: Many areas have sandy, infertile or saline soils, while some low-lying areas are liable to flooding.
- Inadequate capital and technology: Farmers have limited access to modern irrigation equipment, improved seeds, storage facilities and credit.
- Remoteness and poor transport: The basin is far from major markets and ports; poor roads increase the cost of moving farm produce.
- Insecurity and inadequate social amenities: Conflict, sparse settlement, limited health facilities and low educational levels discourage investment.
Ibeere 20 Ìròyìn
Distinguish between the tropical grassland and temperate grassland under the following headings
(a) Location (b) Climate (c) Vegetation characteristics
Distinction between tropical grassland and temperate grassland
(a) Location
| Tropical grassland (savanna) | Temperate grassland |
|---|---|
| Lies within the tropics, roughly between latitudes 5° and 15° north and south of the Equator. | Lies in the interiors of continents in the mid-latitudes, roughly between 30° and 55° north and south. |
| Examples: savanna of West Africa and East Africa, llanos and campos of South America, northern Australia. | Examples: prairies of North America, pampas of Argentina, steppes of Eurasia, veld of South Africa, downs of Australia. |
(b) Climate
| Tropical grassland | Temperate grassland |
|---|---|
| Hot throughout the year (about 21-32°C), with a distinct wet season and dry season. | A wide annual temperature range with hot summers and cold winters (often below freezing). |
| Moderate rainfall (about 500-1500 mm) mainly in the high-sun (summer) season. | Moderate to low rainfall (about 250-750 mm), mostly in summer, with dry winters and occasional snow. |
(c) Vegetation characteristics
| Tropical grassland | Temperate grassland |
|---|---|
| Tall, coarse grasses (up to 3-4 metres) that turn brown in the dry season. | Short, fine, nutritious grasses forming a continuous carpet. |
| Scattered, drought- and fire-resistant trees (acacia, baobab) with flat crowns; a mixed grass-and-tree landscape. | Almost treeless; trees are found only along river courses. |
| Grasses grow in tufts and trees are deciduous and fire-adapted. | Grasses have deep roots and lie dormant in winter; provide excellent pasture and cereal land. |
Awọn alaye Idahun
Distinction between tropical grassland and temperate grassland
(a) Location
| Tropical grassland (savanna) | Temperate grassland |
|---|---|
| Lies within the tropics, roughly between latitudes 5° and 15° north and south of the Equator. | Lies in the interiors of continents in the mid-latitudes, roughly between 30° and 55° north and south. |
| Examples: savanna of West Africa and East Africa, llanos and campos of South America, northern Australia. | Examples: prairies of North America, pampas of Argentina, steppes of Eurasia, veld of South Africa, downs of Australia. |
(b) Climate
| Tropical grassland | Temperate grassland |
|---|---|
| Hot throughout the year (about 21-32°C), with a distinct wet season and dry season. | A wide annual temperature range with hot summers and cold winters (often below freezing). |
| Moderate rainfall (about 500-1500 mm) mainly in the high-sun (summer) season. | Moderate to low rainfall (about 250-750 mm), mostly in summer, with dry winters and occasional snow. |
(c) Vegetation characteristics
| Tropical grassland | Temperate grassland |
|---|---|
| Tall, coarse grasses (up to 3-4 metres) that turn brown in the dry season. | Short, fine, nutritious grasses forming a continuous carpet. |
| Scattered, drought- and fire-resistant trees (acacia, baobab) with flat crowns; a mixed grass-and-tree landscape. | Almost treeless; trees are found only along river courses. |
| Grasses grow in tufts and trees are deciduous and fire-adapted. | Grasses have deep roots and lie dormant in winter; provide excellent pasture and cereal land. |
Ibeere 21 Ìròyìn
Highlight the similarities and differences between latitudes and longitude
Similarities and differences between latitude and longitude
Similarities
- Both are imaginary lines drawn on the globe or map to help locate places.
- Both are measured in degrees (°), minutes and seconds, using the centre of the Earth as reference.
- Both form part of the grid system; a place is fixed precisely by giving its latitude and longitude together.
- Both have a reference (0°) line: the Equator for latitude and the Greenwich (Prime) Meridian for longitude.
Differences
| Latitude | Longitude |
|---|---|
| Lines run east to west (drawn horizontally), measuring distance north or south of the Equator. | Lines run north to south from pole to pole (drawn vertically), measuring distance east or west of the Prime Meridian. |
| They are parallel to one another and never meet; hence called parallels. | They are not parallel; they converge and meet at the two Poles. |
| They are of unequal length; the Equator is the longest and lines shorten toward the Poles. | They are all of equal length, each being a full semicircle from pole to pole. |
| Range from 0° to 90° N and 0° to 90° S (91 lines each way). | Range from 0° to 180° E and 0° to 180° W. |
| Reference line is the Equator (0°). | Reference line is the Greenwich Meridian (0°). |
| Used mainly to determine climatic/temperature zones and distance north-south. | Used mainly to determine time and longitudinal difference (\(15°\) of longitude = 1 hour). |
Awọn alaye Idahun
Similarities and differences between latitude and longitude
Similarities
- Both are imaginary lines drawn on the globe or map to help locate places.
- Both are measured in degrees (°), minutes and seconds, using the centre of the Earth as reference.
- Both form part of the grid system; a place is fixed precisely by giving its latitude and longitude together.
- Both have a reference (0°) line: the Equator for latitude and the Greenwich (Prime) Meridian for longitude.
Differences
| Latitude | Longitude |
|---|---|
| Lines run east to west (drawn horizontally), measuring distance north or south of the Equator. | Lines run north to south from pole to pole (drawn vertically), measuring distance east or west of the Prime Meridian. |
| They are parallel to one another and never meet; hence called parallels. | They are not parallel; they converge and meet at the two Poles. |
| They are of unequal length; the Equator is the longest and lines shorten toward the Poles. | They are all of equal length, each being a full semicircle from pole to pole. |
| Range from 0° to 90° N and 0° to 90° S (91 lines each way). | Range from 0° to 180° E and 0° to 180° W. |
| Reference line is the Equator (0°). | Reference line is the Greenwich Meridian (0°). |
| Used mainly to determine climatic/temperature zones and distance north-south. | Used mainly to determine time and longitudinal difference (\(15°\) of longitude = 1 hour). |
