JAMB UTME - Geography - 2025

Detalles de la respuesta

The characteristics that are true of most large cities are having large populations (statement I) and being commercial centres (statement IV).

By definition, large cities have large populations. This is the primary criterion that makes them "large." Additionally, most large cities serve as major commercial centres, hosting markets, businesses, industries, financial institutions, and trade activities that drive economic growth. Commerce is a near-universal feature of large urban settlements.

Statement II (administrative centres) is not true of most large cities. While some large cities serve as national or regional capitals, many do not. For example, Lagos in Nigeria is the largest city but is not the federal capital (Abuja is). Similarly, Mumbai in India is larger than New Delhi, and Sao Paulo in Brazil is larger than Brasilia. Being an administrative centre is not a defining feature of city size.

Statement III (religious centres) is even less universally applicable. While some large cities like Rome or Mecca have religious significance, the vast majority of large cities are not primarily religious centres. Religious importance is incidental, not a characteristic of most large cities.

Detalles de la respuesta

Underground water (groundwater) is stored within rocks in a zone called the zone of saturation. For a rock to retain underground water, it must have interconnected pore spaces, fractures, or gaps between its grains that allow water to seep in and be held. This property is called permeability.

A permeable rock allows water to pass into and through it because its pores or cracks are connected. Rocks such as sandstone and chalk are permeable and can act as aquifers, storing large volumes of groundwater.

A compact rock has tightly packed grains with minimal pore space, so it cannot absorb or store significant water. A crystalline rock (such as granite) has an interlocking crystal structure with very few connected pores, making it a poor water store. An impermeable rock actively prevents water from passing through it at all, meaning water runs off its surface rather than being retained within it.

The correct answer is permeable, because only a rock with connected pore spaces can absorb, hold, and transmit underground water.

Detalles de la respuesta

The major mountain belts of the world, such as the Himalayas, the Alps, the Andes, and the Rockies, were produced by folding. These are known as fold mountains.

Folding occurs when tectonic plates converge (move toward each other). The immense compressional forces squeeze layers of sedimentary rock that have accumulated in geosynclines (deep troughs on the ocean floor) between the plates. These rock layers are crumpled and pushed upward into a series of folds, forming mountain ranges. The upward arches are called anticlines and the downward troughs are called synclines.

The other processes do not create mountain belts:

• Wind erosion wears down existing landforms; it does not build mountains.
• Glacial erosion carves and reshapes existing mountains (creating features like cirques, aretes, and U-shaped valleys) but does not produce them in the first place.
• Weathering is the breakdown of rocks in place by physical, chemical, or biological processes. It destroys rather than builds mountains.

All the world's young fold mountain systems were formed by plate convergence and the folding of sedimentary strata, making folding the correct process.

Detalles de la respuesta

The best location for a bakery is near a large market for bread. This is because bread is a perishable product that must reach consumers quickly while it is still fresh. Locating near the market (the consumers) minimises transport time and cost for the finished product and ensures the bread arrives fresh.

In industrial geography, this is an example of a market-oriented industry. Industries tend to locate near their market when:

• The finished product is more perishable or bulky than the raw materials
• The product gains weight or volume during production (bread dough expands during baking, and moisture is added)
• Consumer demand requires frequent, rapid delivery

The other factors are less decisive:

• A regular source of flour matters, but flour is a dry, non-perishable commodity that can be transported and stored easily.
• Cheap labour is not a primary consideration because modern bakeries are not highly labour-intensive.
• Clean water is important but is available from municipal supply in most locations.

For any perishable or weight-gaining product, proximity to the market is the most important locational factor.

Detalles de la respuesta

Marine (coastal) processes can be divided into erosion and deposition. A stack is a classic landform produced by marine erosion.

Stacks form through a sequence of erosional stages:

1. Waves attack lines of weakness (joints and faults) in a headland through hydraulic action, abrasion, and corrosion.
2. A cave is carved into the headland.
3. If caves form on both sides and eventually meet, an arch is created.
4. Continued erosion widens the arch until its roof collapses, leaving an isolated column of rock standing in the sea - this is a stack.

The other options are landforms produced by deposition, not erosion. A spit is a ridge of sand or shingle extending from the coast, formed by longshore drift. A beach is an accumulation of sand, pebbles, or shingle deposited by wave action. A mud-flat is a low-lying area of fine sediment deposited in sheltered coastal zones such as estuaries.

Detalles de la respuesta

An equatorial climate is characterised by high temperatures and heavy rainfall throughout the year, with no distinct dry season. To identify which pair of activities would NOT be found in this climate, consider what each activity requires:

• Commercial grain farming (activity 1) involves large-scale cultivation of cereals like wheat, maize, or barley. This requires a distinct dry season for harvesting and thrives in temperate grasslands (prairies, steppes, pampas), not in the constantly wet equatorial zone.
• Rice cultivation (activity 2) can thrive in equatorial regions because rice grows well in warm, waterlogged conditions.
• Lumbering (activity 3) is a major activity in equatorial regions, where dense tropical rainforests provide valuable hardwood timber.
• Plantation agriculture (activity 4) is well-suited to equatorial climates, producing crops such as rubber, oil palm, cocoa, and coffee.
• Dry farming (activity 5) is a technique used in arid and semi-arid areas with limited rainfall. It involves conserving soil moisture through specific tillage practices. This is entirely unsuitable for the equatorial zone, which has excessive rainfall year-round.

The two activities incompatible with an equatorial climate are therefore commercial grain farming and dry farming (activities 1 and 5). Both require drier conditions that the equatorial zone does not provide.

Detalles de la respuesta

This question tests the concept of the environmental lapse rate, which states that temperature decreases by approximately 6.5 \(^\circ\)C for every 1000 metres of altitude gained in the troposphere.

Given information:

• Surface temperature = 40 \(^\circ\)C
• Altitude of the aeroplane = 4000 m
• Lapse rate = 6.5 \(^\circ\)C per 1000 m

Calculation:

Temperature drop = lapse rate \(\times\) altitude (in thousands of metres)

Temperature at 4000 m:

The temperature around the aeroplane at 4000 metres altitude is 14 \(^\circ\)C.

Exam tip: Always use the standard environmental lapse rate of 6.5 \(^\circ\)C per 1000 m unless a different rate is specified in the question. Convert altitude to kilometres before multiplying.

Detalles de la respuesta

Population density measures how many people live per unit area of land. It is calculated using the formula:

\[\text{Population Density} = \frac{\text{Total Population}}{\text{Total Land Area}}\]

Substituting the given values:

\[\text{Population Density} = \frac{140{,}000{,}000}{500{,}000} = 280 \text{ persons per km}^2\]

The correct answer is 280 persons per km\(^2\). The other options result from arithmetic errors: dividing incorrectly or using the wrong figures in the formula.

Detalles de la respuesta

A year is defined as the time it takes for the Earth to complete one full revolution (orbit) around the Sun. This orbital period is approximately 365.25 days, which is why we say a year has \(365\frac{1}{4}\) days.

To account for the extra quarter-day, the calendar adds one extra day every four years, creating a leap year of 366 days (29 February).

The other options describe different astronomical motions:

• The Sun does orbit the centre of the Milky Way galaxy, but this takes approximately 225-250 million years, not 365 days.
• The Moon revolves once around the Earth in approximately 27.3 days (sidereal month) or 29.5 days (synodic month), which defines a lunar month, not a year.
• The Earth rotating on its axis takes approximately 24 hours and defines a day, not a year.

The distinction between rotation (spinning on an axis, producing day and night) and revolution (orbiting around another body, producing the year and seasons) is fundamental in physical geography and astronomy.

Detalles de la respuesta

Gold is Ghana's most important industrial mineral. Ghana was historically known as the Gold Coast precisely because of its abundant gold deposits, and gold mining remains the country's leading mineral industry and a major source of export revenue.

Ghana is one of the largest gold producers in Africa, with major mining operations at Obuasi (operated by AngloGold Ashanti), Tarkwa, and other sites in the Ashanti and Western regions. The gold mining sector is the backbone of Ghana's mining industry and contributes significantly to government revenue and employment.

While Ghana also has deposits of bauxite (at Awaso and Nyinahin) and diamonds (at Akwatia), these are of secondary importance compared to gold. Bauxite mining feeds into aluminium smelting at the Volta Aluminium Company (VALCO) smelter in Tema, but the scale and economic impact of the gold industry far exceeds that of bauxite or diamond mining in Ghana.

Detalles de la respuesta

The incorrect statement is that Scandinavia is noted for its hardwood timber. Scandinavia (Norway, Sweden, Finland) lies in high northern latitudes dominated by the coniferous (boreal) forest biome, also called the taiga. The characteristic trees are softwood species such as spruce, pine, and fir. Hardwood trees like teak, mahogany, and ebony are found in tropical and temperate deciduous forests, not in Scandinavia.

The remaining statements are all factually correct:

• The North Sea is one of the world's most productive fishing grounds, benefiting from shallow continental shelf waters rich in plankton.
• Katanga (now Haut-Katanga province in the Democratic Republic of Congo) is one of the world's leading copper-mining regions, forming part of the Central African Copperbelt.
• The Ruhr in western Germany is historically one of Europe's greatest industrial regions, built on coal and steel production.

When identifying incorrect statements about world regions, pay attention to the type of natural vegetation associated with each climatic zone: coniferous forests produce softwood, not hardwood.

Detalles de la respuesta

Function is the criterion used to classify settlements into rural or urban. The function of a settlement refers to the main economic activities and services it provides. Rural settlements are characterised by primary activities (farming, fishing, mining, forestry), while urban settlements are characterised by secondary activities (manufacturing), tertiary activities (services, trade, banking), and quaternary activities (research, information technology).

Geographers classify settlements as rural or urban based on what the settlement does - what its residents primarily do for a living and what services the settlement offers. A settlement dominated by agriculture and related primary industries is rural; one dominated by commerce, industry, and services is urban.

The other criteria do not reliably distinguish rural from urban:

• Location does not determine whether a settlement is rural or urban. Urban centres can be found in valleys, on coasts, or on plains, just as rural settlements can.
• Age is irrelevant; old settlements can be either rural or urban, and new settlements can be either type.
• Site refers to the physical characteristics of the land on which a settlement is built (hilltop, riverside, etc.). This influences where a settlement develops but does not determine its rural or urban character.

Detalles de la respuesta

A wadi is a feature produced by water in desert areas. A wadi is a valley, ravine, or channel that is dry for most of the year but carries water during occasional heavy rainstorms. The intermittent but sometimes torrential flow of water carves out these channels through erosion over time, creating distinctive dry valleys across desert landscapes.

Wadis are common in the Sahara Desert, the Arabian Desert, and other arid regions. They are important because they indicate the work of running water even in environments where water is scarce. After rain, wadis may fill rapidly and produce flash floods before drying out again.

The other options are all features produced by wind action, not water:

• Barchans are crescent-shaped sand dunes formed by wind deposition.
• Yardangs are elongated, streamlined ridges carved by wind abrasion.
• Zeugens are tabular rock formations where wind abrasion has eroded softer lower layers, leaving a harder caprock on top (mushroom-shaped rocks).

Detalles de la respuesta

Enugu is not a pre-colonial town. It was established and developed in the early twentieth century by the British colonial administration following the discovery of coal deposits in the area in 1909. The town grew as a coal-mining centre and later became the capital of the Eastern Region of Nigeria under colonial rule. Its origin and growth are directly tied to colonial economic activity.

The other towns all existed before the arrival of European colonisers:

• Bida is an ancient town and the seat of the Nupe kingdom (the Etsu Nupe), with origins predating colonial contact.
• Ilorin was an important Yoruba town that became the capital of an emirate in the early 19th century under Fulani rule, well before British colonisation.
• Ibadan was founded around 1829 as a war camp by Yoruba warriors and grew into one of the largest cities in pre-colonial West Africa.

Detalles de la respuesta

The Earth's axis is tilted at approximately 23.5 degrees relative to its orbital plane. As the Earth orbits the Sun, this tilt causes the Sun to appear directly overhead at different latitudes throughout the year.

The Tropic of Capricorn is located at latitude 23.5 degrees S. The Sun is directly overhead at this latitude during the December solstice, which occurs on or around December 22. At this time, the Southern Hemisphere is tilted toward the Sun, making it the longest day in the Southern Hemisphere and the shortest in the Northern Hemisphere.

The other dates correspond to different astronomical events:

• June 21 is the summer solstice, when the Sun is overhead at the Tropic of Cancer (23.5 degrees N).
• September 23 is the autumnal equinox, when the Sun is overhead at the Equator.
• March 21 is the vernal equinox, when the Sun is again overhead at the Equator.

The correct answer is December 22.

Detalles de la respuesta

When a river's gradient changes from steep to gentle, its velocity decreases. A river's ability to transport sediment depends on its velocity and energy. As the gradient flattens and the water slows down, the river loses energy and can no longer carry its full sediment load. The river therefore begins depositing material.

This is a direct application of the Hjulstrom curve principle: faster-flowing water erodes and transports, while slower-flowing water deposits. The transition from a steep to a gentle gradient is exactly the condition that triggers deposition.

Common real-world examples of this process include:

• Alluvial fans - formed where a mountain stream meets a flat plain
• Flood plains and deltas - formed where rivers slow down on reaching low-lying areas or the sea
• Levees - built up when a river overflows its banks and immediately loses velocity

Erosion and deepening are dominant processes on steep gradients where the river has high velocity and energy. Terracing is an agricultural land-management technique, not a natural river process.

Detalles de la respuesta

Drumlins are smooth, oval-shaped (egg-shaped) hills composed of glacial till - a mixture of boulders, sand, gravel, and clay deposited by a glacier. They are typically 1-2 km long and 300-600 m wide, with a steeper end (stoss) facing the direction from which the glacier advanced and a gentler, tapering end (lee) pointing in the direction of ice flow.

Drumlins often occur in groups called drumlin swarms or a "basket of eggs" landscape. Their exact formation is debated, but they are shaped by the pressure and movement of the overlying ice sheet moulding previously deposited glacial material.

The other options are different glacial landforms:

• An arete is a sharp, knife-edged ridge formed by erosion between two adjacent cirques (corries). It is an erosional feature, not a depositional one.
• A moraine is a ridge or mound of unsorted glacial debris (till), but moraines are typically irregular ridges rather than smooth oval hills.
• An esker is a long, sinuous (winding) ridge of sand and gravel deposited by meltwater streams flowing beneath or within a glacier.

Detalles de la respuesta

Ocean currents are classified as either warm or cold depending on whether their water temperature is higher or lower than the surrounding ocean water. Warm currents flow from equatorial regions toward the poles, while cold currents flow from polar regions toward the equator.

The Mozambique current is a warm current. It flows southward along the coast of Mozambique in the Indian Ocean, carrying warm tropical water from near the equator toward higher latitudes. It warms the southeastern coast of Africa and eventually feeds into the Agulhas Current.

The other three currents are all cold:

• The Benguela current flows northward along the south-west coast of Africa, carrying cold water from the Southern Ocean and producing the cool, dry conditions of the Namib Desert.
• The Labrador current flows southward from the Arctic along the north-east coast of North America, bringing cold water and icebergs past Newfoundland.
• The Canaries current flows southward along the north-west coast of Africa, carrying cool water from higher latitudes and contributing to the aridity of the western Sahara coastline.

A reliable pattern to remember: currents flowing from the equator toward the poles are warm; those flowing from the poles toward the equator are cold.

Detalles de la respuesta

Annual rainfall is the total amount of rainfall received at a station over the course of a full year. To find it, add up the monthly rainfall figures for all twelve months provided in the climate data table for station X.

The monthly rainfall values (in mm) from the table are:

Summing these values step by step:

\[ 62 + 50 + 56 + 89 + 180 + 189 + 140 + 163 + 228 + 230 + 83 + 41 = 1511 \text{ mm} \]

The annual rainfall for station X is therefore 1511 mm.

Common errors on this type of question include accidentally skipping a month when adding (which would give a lower total) or misreading a value from the table. Always count to confirm you have included all twelve months before finalising your sum.

Detalles de la respuesta

Lake Malawi (also known as Lake Nyasa) owes its origin mainly to faulting. It occupies the southern end of the East African Rift System, a massive geological structure formed by tectonic forces pulling the African plate apart. As the Earth's crust was stretched and fractured, blocks of rock dropped down between parallel fault lines, creating a deep, narrow trough called a graben. Lake Malawi fills one of these grabens, reaching depths of over 700 metres.

Other rift valley lakes formed by the same faulting mechanism include Lake Tanganyika, Lake Albert, and Lake Turkana.

The other lakes have different origins:

• Lake Superior was shaped primarily by glacial erosion during the Pleistocene ice ages, when advancing ice sheets scoured and deepened pre-existing river valleys in North America.
• Lake Victoria is not a rift lake. It formed by down-warping (gentle sagging of the Earth's surface) between the eastern and western branches of the rift, creating a broad, shallow basin.
• Lake Chad occupies a shallow depression formed by gentle subsidence in the interior of West-Central Africa. It is an extremely shallow lake, unlike the deep rift lakes.

Detalles de la respuesta

The Earth has two main motions: rotation (spinning on its axis, completing one turn every 24 hours) and revolution (orbiting the Sun, completing one circuit every 365.25 days). Each motion produces different phenomena.

Phenomena directly caused by rotation include:

• Night and day - as the Earth rotates, different parts face toward or away from the Sun.
• The deflection of winds and ocean currents (Coriolis effect).
• The apparent movement of the Sun across the sky.

Seasonal changes are caused by the Earth's revolution around the Sun combined with the tilt of the Earth's axis (23.5 degrees from the perpendicular to the orbital plane). As the Earth orbits the Sun, different hemispheres are tilted toward or away from the Sun at different times of the year, producing the seasons. Rotation plays no role in this process.

Varying duration of sunshine hours and unequal solar radiation on the Earth's surface are also consequences of the axial tilt and the Earth's spherical shape, but the question asks specifically about what is not directly related to rotation, and seasonal changes is the clearest answer since it depends entirely on revolution and axial tilt.

Detalles de la respuesta

Urban floods are mainly caused by the blockage of drains and waterways. In cities, rainwater is channelled through drainage systems, gutters, and waterways. When these become blocked by refuse, debris, silt, or unplanned construction, water cannot flow away efficiently. During heavy rainfall, the water accumulates on roads and in low-lying areas, resulting in flooding.

Urbanisation itself creates large areas of impermeable surfaces (concrete, tarmac, roofing) that prevent water from soaking into the ground, making cities already vulnerable to surface flooding. When blocked drains compound this problem, the result is severe urban flooding.

Clearance of vegetation on farmlands can contribute to flooding in rural areas through increased surface runoff, but it is not the primary cause of specifically urban flooding. Construction of dams and barrages is actually a flood-control measure, and establishment of shelter belts (rows of trees) is a method of reducing wind erosion, not a cause of flooding.

Detalles de la respuesta

A waterfall is the feature associated with the upper course of a river. In the upper course (near the river's source, typically in highland or mountainous terrain), the river flows over steep gradients with high velocity. Where the river crosses bands of rock with different levels of resistance, the softer rock is eroded more quickly than the harder rock, creating a sudden vertical drop in the riverbed. This produces a waterfall.

The upper course is characterised by vertical erosion (downcutting), steep-sided V-shaped valleys, interlocking spurs, rapids, gorges, and waterfalls. The river here has a small volume but high energy due to the steep gradient.

The other features belong to the middle or lower course of a river:

• A meander is a winding bend in a river, typical of the middle and lower courses where lateral (sideways) erosion becomes more significant than vertical erosion.
• A levee is a raised bank along the sides of a river in its lower course, formed by the deposition of sediment during floods.
• A delta is a fan-shaped deposit of sediment formed at the mouth of a river where it enters a sea or lake, characteristic of the very end of the lower course.

Detalles de la respuesta

This question tests the ability to read contour lines on a topographic map. Contour lines are lines drawn on a map connecting points of equal elevation above sea level. Each contour line is labelled with its height value, and the vertical spacing between successive contour lines is called the contour interval.

To find the highest contour line on the map, you must examine all the contour lines across the entire mapped area and identify the one with the greatest elevation value. On the Abada District map, contour lines are marked at regular intervals. Reading the values printed along the contour lines, the elevations shown include values such as 100, 200, 300, and 400 metres. The highest contour line visible on this map reaches 400 metres, located in the area of higher ground in the upper-central portion of the map where the terrain rises.

The other options can be eliminated by careful reading of the map. No contour line labelled 500 metres or 600 metres appears anywhere within the mapped area, so those values exceed the actual highest elevation shown. A value of 300 metres, while present on the map as a contour line, is not the highest one since the 400-metre contour line sits above it in the same elevated zone.

The correct answer is 400 metres.

Exam tip: When identifying the highest or lowest contour line on a map, systematically scan the entire map rather than focusing on just one area. Pay close attention to the numerical labels printed directly on the contour lines, especially in areas where the lines are closely spaced, which indicates steep terrain and often marks the highest ground.

Detalles de la respuesta

Frost action is not a process of chemical weathering. It is a process of physical (mechanical) weathering. Frost action (also called freeze-thaw weathering) occurs when water seeps into cracks in rocks and freezes. As water freezes, it expands by about 9%, exerting pressure on the surrounding rock. Repeated cycles of freezing and thawing gradually widen the cracks until pieces of rock break off. No chemical change occurs in this process.

The other three options are all genuine processes of chemical weathering:

• Hydrolysis is a chemical reaction between minerals in rock and water. Feldspar in granite, for example, reacts with water to form clay minerals (kaolinite), weakening the rock.
• Oxidation is the reaction between minerals (especially iron-bearing minerals) and oxygen in the presence of moisture. It produces iron oxides (rust), giving rocks a reddish-brown colour and making them crumble.
• Carbonation is the reaction between carbon dioxide dissolved in rainwater (forming weak carbonic acid) and calcium carbonate in limestone. The calcium carbonate dissolves, creating features such as caves, sinkholes, and karst landscapes.

Exam tip: Physical weathering breaks rock without changing its chemical composition. Chemical weathering alters the mineral composition of the rock through reactions with water, oxygen, or acids.

Detalles de la respuesta

Hydraulic action is a process of wave erosion. It occurs when waves crash against rock surfaces and force air into cracks and joints in the rock. The repeated compression and expansion of trapped air exerts enormous pressure, gradually weakening and breaking apart the rock. This is one of the primary ways waves erode coastlines, forming features such as cliffs, caves, arches, and stacks.

The other options are all processes of transportation, not erosion:

• Saltation is the bouncing movement of particles along a surface, carried intermittently by wind or water.
• Traction involves large, heavy particles being rolled or dragged along the bed by the force of moving water or wind.
• Suspension is the carrying of fine, light particles within the body of moving water or air.

The key distinction is that erosion refers to the wearing away and removal of rock material, while transportation refers to how already-eroded material is moved from one place to another.

Detalles de la respuesta

Canada is one of the world's leading countries in commercial grain farming. The Canadian Prairies (Alberta, Saskatchewan, and Manitoba) form one of the largest commercial grain-producing regions in the world, with wheat being the principal crop. Canada is consistently among the top global exporters of wheat, barley, and canola.

Commercial grain farming is characterised by:

• Large-scale, highly mechanised operations covering vast areas of flat land.
• Production primarily for sale and export rather than subsistence.
• A temperate continental climate with warm summers suitable for grain cultivation.

Spain has a diversified agricultural sector including olives, wine, and fruits, but is not primarily known for commercial grain farming on the scale of Canada. Kenya's agriculture is dominated by cash crops (tea, coffee, flowers) and subsistence farming. Nigeria's agriculture is largely subsistence-based with some commercial crops (cocoa, palm oil, rubber), but not large-scale commercial grain farming in the way Canada practises it.

Detalles de la respuesta

Freetown, the capital of Sierra Leone, has the highest mean annual rainfall among these cities, receiving approximately 3,600 mm per year. It ranks among the wettest capital cities in Africa.

Freetown's exceptionally high rainfall is explained by its location and relief:

• It sits on the coast of West Africa directly in the path of the moisture-laden south-west monsoon winds blowing from the Atlantic Ocean.
• The Freetown Peninsula mountains (rising to about 900 m) force these moist winds upward, producing intense orographic (relief) rainfall in addition to the convectional rainfall common to the region.

By comparison, Lagos receives about 1,600 mm annually, while Accra and Lome are notably drier (around 800 mm each) because they lie in a rain shadow zone along the Gulf of Guinea coast where the coastline runs parallel to the prevailing winds, reducing moisture uplift.

When comparing rainfall totals for West African cities, remember that orographic factors can greatly amplify rainfall where highland terrain faces onshore winds.

Detalles de la respuesta

The correct distinction between rotation and revolution is that the Earth rotates on its axis while it revolves round the sun on an elliptical orbit.

Rotation is the spinning of the Earth on its own imaginary axis (an imaginary line running from the North Pole to the South Pole). One complete rotation takes approximately 24 hours and is responsible for the alternation of day and night.

Revolution is the movement of the Earth around the Sun along an elliptical (slightly oval-shaped) path called an orbit. One complete revolution takes approximately 365.25 days (one year) and is responsible for the change of seasons, variation in the length of day and night throughout the year, and the apparent movement of the overhead sun between the tropics.

The other options contain factual errors:

• Revolution does not cause day and night; rotation does. And rotation does not cause seasons; revolution (combined with the tilt of the Earth's axis) does.
• Revolution does not take 24 hours; it takes approximately 365.25 days. Rotation does not mark a year; it marks a day.
• Rotation does not cause variation in the lengths of day and night; revolution and axial tilt do. Neither rotation nor revolution causes tides (tides are caused by gravitational pull of the moon and sun).

Detalles de la respuesta

The Middle Belt of Nigeria has long been described in geography texts by three linked features: much of its land has historically supported comparatively low population density, it lies within a zone affected by insect pests and disease-carrying vectors such as the tsetse fly, and large tracts of its soil have been regarded as less productive than the richer alluvial soils found elsewhere in the country, partly because of leaching and erosion on its plateau and highland surfaces.

These three characteristics are not independent of one another. The presence of disease-carrying insects historically discouraged both human settlement and livestock keeping across parts of the Middle Belt, which in turn kept population figures low; sparse population and limited investment in soil management then contributed to lower agricultural productivity on much of the land. Because every one of the three specific statements offered, low soil productivity, presence of insect pests and disease vectors, and sparse population, matches a genuinely documented feature of the region, none of them is the false statement being sought.

A question asking which statement is not true is only answered by picking out a genuinely false claim from among the ones listed. Here, since all three descriptive statements about the Middle Belt hold up against known geography, the only logically consistent conclusion is that none of the given statements is untrue.

When a question of this kind offers a choice indicating that no false statement is present among those listed, test each statement individually before selecting it; it is only correct when every other statement survives scrutiny as true.

Detalles de la respuesta

The range of temperature for a station is the difference between the highest and lowest recorded temperatures over a given period. It is calculated as:

\[ \text{Range} = \text{Maximum temperature} - \text{Minimum temperature} \]

From the climate data table provided, the monthly temperatures (in °C) are:

Scanning across the row, the highest temperature is 30°C (recorded in August) and the lowest temperature is 16°C (recorded in January).

Substituting into the formula:

\[ \text{Range} = 30°C - 16°C = 14°C \]

The range of temperature for the station is therefore 14°C.

A common error is confusing the range with the mean (average) temperature or reading the wrong row (such as rainfall instead of temperature). Always identify the correct data row first, then pick out the single highest and single lowest values before subtracting.

Detalles de la respuesta

Industries are broadly classified into three sectors: primary, secondary, and tertiary. This is the standard three-sector model used in economics and geography to categorise all economic activities.

• Primary industries extract raw materials directly from nature. Examples include farming, fishing, mining, forestry, and quarrying.
• Secondary industries process and manufacture raw materials into finished or semi-finished goods. Examples include food processing, textile manufacturing, steel production, and construction.
• Tertiary industries provide services rather than tangible goods. Examples include banking, education, healthcare, transport, and retail trade.

The option listing "primary, secondary, and manufacturing" is incorrect because manufacturing is a subset of the secondary sector, not a separate broad classification alongside it. Using manufacturing as a third category creates an overlap with secondary.

The other two options (fishing, mining, and food processing; or mining, furniture making, and cocoa processing) list specific industries rather than broad classifications. These are examples of industries within the primary and secondary sectors, not the categories themselves.

Detalles de la respuesta

Rural-urban migration is the most significant factor driving rapid population growth in the capital cities of West Africa. This is the large-scale movement of people from rural villages and towns to urban centres, particularly capital cities, in search of better employment, education, healthcare, and general living conditions.

West African capital cities such as Lagos (former capital of Nigeria), Accra, Dakar, and Abidjan have experienced explosive population growth primarily because of the continuous influx of rural dwellers. The "push" factors in rural areas include poverty, limited social amenities, lack of educational institutions, and poor infrastructure. The "pull" factors in cities include perceived job opportunities, better schools and hospitals, and modern amenities.

Political rallies, sport events, and religious tourism may temporarily increase the number of people in a city, but they do not cause permanent population growth. These are short-term gatherings after which attendees return to their places of origin. Rural-urban migration, by contrast, involves permanent or long-term relocation, which directly increases the resident population of the city.

Detalles de la respuesta

A Representative Fraction (RF) expresses a map scale as a ratio with no units: 1 unit on the map represents a certain number of the same units on the ground. To determine the RF from a map, you use the linear (bar) scale printed on the map and measure how many centimetres on the map correspond to a known ground distance.

The map of Abada District includes a linear scale bar at the bottom. By examining the scale bar, 2 cm on the map corresponds to 1 km on the ground. Converting to the same unit:

\[ 1 \text{ km} = 1{,}000 \text{ m} = 100{,}000 \text{ cm} \]

So if 2 cm on the map represents 100,000 cm on the ground:

\[ 1 \text{ cm on map} = \frac{100{,}000}{2} = 50{,}000 \text{ cm on ground} \]

The RF is therefore 1:50,000. This means 1 cm measured on the map equals 50,000 cm (or 0.5 km) on the actual ground.

A common error is misreading the scale bar divisions or making a unit conversion mistake. For instance, forgetting to divide by the number of centimetres measured on the bar scale would give 1:100,000, which is too small a scale. Similarly, doubling the ratio in the wrong direction would give 1:25,000, which would mean the map shows features at twice the detail it actually does.

When converting a linear scale to RF, always measure the bar scale length in centimetres, convert the ground distance to the same unit (centimetres), and then express the ratio as 1 : (ground cm per 1 map cm).

Detalles de la respuesta

The Nile Valley in Egypt is dominated by the Aswan High Dam, a large barrage built across the river to control its flow and store water in Lake Nasser. Beyond flood control and irrigation storage, the dam houses a major hydro-electric power station whose turbines convert the energy of the impounded water into electricity that is distributed across Egypt's national grid.

This large-scale generation of hydro-electric power from the Nile's flow is the feature of the Nile Valley most often highlighted in geography syllabuses when the valley's economic significance is discussed, because it represents a single engineered project that transformed the river's natural energy into a nationally important power supply. That is why hydro-electricity is identified as what the Nile Valley is best known for.

Industrial development, water navigation, and commerce all take place to some extent along the Nile, but none of them is as specifically and closely tied to the valley's defining infrastructure as the hydro-electric generation made possible by the Aswan High Dam.

When a question asks what a river valley is best known for, look for the single engineered or natural feature most consistently emphasised in textbooks, rather than listing every economic activity that happens to occur along its banks.

Detalles de la respuesta

Acid rain is a major environmental problem in heavily industrialised regions. It forms when sulphur dioxide (SO₂) and nitrogen oxides (NO_x) released from the burning of fossil fuels in factories, power plants, and vehicles react with water vapour, oxygen, and other chemicals in the atmosphere to form sulphuric acid and nitric acid. These acids then fall to the ground as acidic precipitation (rain, snow, fog, or dry deposition).

Acid rain causes widespread environmental damage in industrialised areas and their downwind neighbours:

• It corrodes buildings, monuments, and metal structures.
• It acidifies lakes and rivers, killing aquatic life.
• It damages forests by leaching nutrients from the soil and harming leaves.
• It degrades soil quality, reducing agricultural productivity.

Accelerated erosion and frost damage are not specifically linked to heavy industrialisation. Water pollution can occur in industrial areas but is a broader problem not unique to the most heavily industrialised regions. Acid rain, by contrast, is directly and characteristically caused by the high concentration of industrial emissions that define heavily industrialised regions.

Detalles de la respuesta

A rift valley is the landform associated with parallel faulting. A rift valley (also called a graben) forms when two roughly parallel normal faults develop in the Earth's crust and the block of land between them subsides or drops downward relative to the blocks on either side. The resulting elongated, steep-sided trough is the rift valley.

The process requires tensional forces in the crust that pull the rock apart, creating two parallel fault lines. The central block, no longer supported, sinks under gravity to form the valley floor, while the upstanding blocks on either side form the valley walls (escarpments). If the side blocks are pushed upward instead, they form block mountains (horsts).

The most famous example is the East African Rift System (also called the Great Rift Valley), stretching from the Red Sea through Ethiopia, Kenya, Tanzania, and Malawi. The Rhine Rift Valley in Europe is another well-known example.

The other options are not formed by parallel faulting:

• A gorge is a narrow, deep valley carved by river erosion.
• An inselberg is an isolated hill or mountain rising above a plain, formed by differential weathering and erosion.
• A dyke is a sheet-like intrusion of igneous rock that cuts across existing rock layers, formed by volcanic activity.

Detalles de la respuesta

The wearing away of the sides and bottom of a river's channel is called corrosion. In the context of river erosion as used in many West African geography curricula, corrosion refers to the grinding and scraping action of the river's sediment load (sand, pebbles, boulders) against the bed and banks of the channel. This is also known as abrasion or corrasion in some textbooks.

The other types of erosion have different meanings:

• Attrition is the process by which transported rock fragments collide with each other and are gradually worn down into smaller, more rounded particles. It acts on the load itself, not on the channel.
• Hydraulic action is the force of the water itself against the banks and bed, including the pressure of water being forced into cracks. It does not involve the grinding action of sediment.
• Corrosion action is not a standard geographical term and serves as a distractor in this question.

When distinguishing between river erosion processes, remember: corrosion (abrasion) wears the channel using the river's load as a tool, attrition wears the load itself, and hydraulic action uses the sheer force of water alone.

Detalles de la respuesta

Great Britain and Germany are both located on the continent of Europe, specifically in the western part. In the context of international trade and geography, they belong to the West Europe trading bloc.

West African countries such as Nigeria, Ghana, and Senegal have long-standing trade relationships with Western European nations. These ties date back to the colonial era and continue today through exports of raw materials (cocoa, crude oil, minerals) from West Africa and imports of manufactured goods and technology from Western Europe.

The other options do not correctly describe the geographic region of Great Britain and Germany. South America is a separate continent entirely. The Far East refers to countries like China, Japan, and Korea in eastern Asia. North America encompasses the United States and Canada. None of these regions includes either Great Britain or Germany.

Exam tip: When asked about trading partners and their regions, identify the continent and sub-region where the named countries are located before evaluating the options.

Detalles de la respuesta

The Abney level (also called a clinometer or Abney clinometer) is a surveying instrument primarily used to measure the angle of inclination (slope angle) of a surface or the angle of elevation/depression between two points.

It consists of a sighting tube, a bubble level, and a graduated arc. The surveyor looks through the tube at a target point, adjusts the bubble level until it is centred (visible in the tube), and then reads the angle from the graduated scale. This gives the vertical angle between the line of sight and the horizontal.

The Abney level is particularly useful for:

• Measuring the gradient (steepness) of slopes in the field.
• Estimating heights of hills or buildings when combined with distance measurement.
• Preliminary surveys where a rough measurement of slope is sufficient.

It does not directly measure area coverage (which requires planimeters or chain/offset methods), spot heights (which need levelling instruments such as the dumpy level), or relative location (which requires compass bearings or GPS).