WAEC SSCE - Geography - 2001 (Objective)

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The correct answer is a sill. When molten magma intrudes into the bedding plane of sedimentary rocks, it can form a horizontal sheet-like body called a sill. The magma solidifies and becomes a new layer of rock that is parallel to the existing sedimentary layers. Sills are usually less than a few hundred meters thick and can vary in size from a few meters to several kilometers in length and width. Sills are commonly found in areas of volcanic activity and are an important feature in the study of geology.

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The vegetation type which is found only in the Northern Hemisphere is the "Tundra vegetation". Tundra vegetation is a type of vegetation that is found in the arctic and subarctic regions of the Northern Hemisphere, where the climate is too cold for trees to grow. Instead, the vegetation is dominated by low-growing shrubs, mosses, and lichens. Tundra vegetation is characterized by its ability to survive in extremely cold and harsh environments, and it is an important habitat for a variety of animals, including caribou, reindeer, and polar bears.

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A planet that is adapted to living in a region where little moisture is available is called a xerophyte. Xerophytes are plants that have evolved to survive in environments with limited water availability, such as deserts, arid regions, and rocky terrain. Xerophytes have a variety of adaptations that enable them to conserve water and tolerate dry conditions. For example, they may have deep root systems that can access water deep in the soil, or they may have specialized leaves that reduce water loss through transpiration. Some xerophytes also have thick, waxy cuticles on their leaves to prevent water loss. Overall, xerophytes are well adapted to living in regions where little moisture is available, and their unique adaptations allow them to survive in some of the harshest environments on our planet.

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The largest producer of gold in West Africa is Ghana. Ghana is known to have large deposits of gold and has been a major producer of the precious metal for many years. It is estimated that Ghana produces about 4.2 million ounces of gold annually, making it the 9th largest gold producer in the world. Gold mining in Ghana is a major contributor to the country's economy, and the industry employs thousands of people directly and indirectly. Ghana's gold mines are mainly located in the southwestern and western parts of the country, and the metal is a major export commodity for the country.

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The ocean current that enhances rainfall in its immediate hinterland is the Mozambique Current. This is because the Mozambique Current is a warm ocean current that flows southwards along the east coast of Africa, bringing warm and moist air from the Indian Ocean to the coastal regions of East Africa. As this warm and moist air rises over the land, it cools and condenses, leading to the formation of clouds and rainfall. This process is known as orographic rainfall and is responsible for the relatively high levels of rainfall experienced in coastal regions such as Tanzania, Kenya and Mozambique. In this way, the Mozambique Current plays a key role in supporting agriculture and other forms of economic activity in these regions.

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The intensity of erosion by a river is determined by the volume of water, gradient of the valley, and the load carried. Erosion by a river refers to the process of wearing away the river's bed and banks over time. The intensity of this erosion is influenced by several factors, including the volume of water flowing in the river, the gradient of the valley through which the river flows, and the load carried by the river. The volume of water flowing in the river determines the amount of energy available for erosion, with higher volumes of water carrying more energy and therefore causing more erosion. The gradient of the valley, or the slope of the land through which the river flows, also influences erosion by affecting the speed of the water flow. Steeper gradients generally lead to faster flow rates and more erosion. The load carried by the river refers to the amount of sediment and other materials that the river is carrying along with it. This load can range from small particles like silt and clay to larger rocks and boulders. The load carried by the river can significantly affect its erosive power, as heavier loads can cause more friction and turbulence in the water, leading to increased erosion. Overall, the intensity of erosion by a river is determined by a combination of these factors, including the volume of water, gradient of the valley, and load carried by the river.

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The initial problems of rain and road development in Africa were primarily due to the difficult physical environment. Africa has a diverse range of physical landscapes, including deserts, savannas, and tropical rainforests, which make it challenging to build infrastructure such as roads. Additionally, heavy rainfall in some regions can cause flooding and erosion, further complicating road development. These factors have historically made it difficult to transport goods and people, leading to economic and social challenges for the continent.

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Megalopolis is the largest settlement type among the options given. A megalopolis is a vast urban region that comprises several metropolitan areas that are physically and economically linked. It is also known as a "super city" or "conurbation." A megalopolis typically includes multiple cities and their surrounding suburbs and towns, which are connected by highways, railroads, and other forms of transportation. These urban regions can cover vast areas and have large populations, with millions of people living within them. Examples of megalopolises around the world include the Northeast megalopolis in the United States, the Pearl River Delta in China, and the Tokyo-Yokohama megalopolis in Japan. In summary, megalopolis is the largest settlement type among the options given, as it comprises multiple metropolitan areas and has a vast geographical area and population.

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Transhumance is the movement of cattle up and down mountains in search of pasture. It involves the seasonal migration of livestock from one region to another, usually from highlands to lowlands, or vice versa, depending on the availability of grazing lands. This practice has been used for centuries by pastoralist communities as a way of sustaining their livestock and adapting to changing environmental conditions.

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The environmental lapse rate refers to the rate at which temperature changes as you move up or down in the atmosphere. In general, the temperature decreases as you go higher in the atmosphere, and this rate of decrease is called the environmental lapse rate. Out of the options provided, the correct answer is "0.60C for every 100 m ascent". This means that for every 100 meters increase in altitude, the temperature in the atmosphere decreases by 0.6 degrees Celsius. It's important to note that this is just an average rate, and the actual rate can vary depending on a number of factors such as time of day, location, and weather conditions. Understanding the environmental lapse rate is important in meteorology and climatology because it can help scientists and forecasters predict how temperature will change with altitude, and how this will affect weather patterns and climate conditions.

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When plateaux are enclosed by fold mountains, they are known as intermont plateaux. Intermont plateaux are formed by the upliftment of a large flat area of land, surrounded by fold mountains, through tectonic forces such as folding and faulting. The formation of intermont plateaux typically involves the uplift of sedimentary rocks, which are then eroded by rivers and other water bodies, leading to the formation of deep canyons and valleys. The plateau itself is usually high above sea level, and often has a relatively flat surface that may be used for agriculture or other economic activities. Intermont plateaux are typically found in areas with high tectonic activity, such as the Himalayas, the Rocky Mountains, and the Andes. They are important geographic features, as they can act as natural barriers to human movement and settlement, and are often home to unique ecosystems and wildlife.

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An example of a crystalline rock is granite. Granite is a type of igneous rock that is formed from the slow cooling and solidification of magma deep beneath the Earth's surface. Granite is composed mainly of quartz, feldspar, and mica, which are minerals that have a crystalline structure. The minerals in granite are visible to the naked eye and give the rock its characteristic speckled appearance. Crystalline rocks like granite are formed through a process of crystallization, in which minerals solidify from a liquid or gas into a highly ordered, three-dimensional structure. This gives them a unique set of physical and chemical properties that distinguish them from other types of rocks. Crystalline rocks are found all over the world and have a variety of uses, including as building materials, decorative stones, and sources of minerals and ores. They can also provide important clues about the geological history and evolution of the Earth's crust.

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The dark clouds extending to a height of about 15,000 metres which bring a lot of rain to tropical lands are known as cumulonimbus clouds. Cumulonimbus clouds are large and towering, with a dark base and a fluffy top that can sometimes resemble an anvil. They are formed by a combination of rising warm air and moisture, which leads to the formation of thunderstorms and heavy rainfall. These clouds are commonly found in tropical regions where the weather is warm and humid. They can also be associated with strong winds, lightning, and hailstones. The heavy rainfall from cumulonimbus clouds is important for agriculture, as it can provide water for crops and replenish water sources. In summary, cumulonimbus clouds are large, dark clouds that bring heavy rainfall to tropical lands. They are formed by rising warm air and moisture and can also be associated with strong winds, lightning, and hailstones.

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The major hazard to both human and aquatic life in some coastal areas of Nigeria is oil spillage. Oil spills occur when oil leaks into the environment, typically from a ship or oil rig, and can have devastating effects on the surrounding ecosystem. Oil spills can harm or kill marine animals and plants, and also contaminate water sources that humans rely on for drinking, cooking, and washing. The oil can also cause air pollution, which can harm people's health, especially those with respiratory issues. Oil spills can be difficult to clean up, and can have long-lasting effects on the environment and the people who live nearby.

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The most ideal location for an iron and steel industry is one that has an adequate supply of iron ore, a good transport network, and an adequate supply of coal. Therefore, the correct option is IV, which includes all three factors. Iron and steel production require large quantities of iron ore and coal, as well as a good transportation network to bring in these raw materials and move finished products to market. The location of iron and steel industries is therefore determined by the proximity of these resources, as well as access to transportation infrastructure. A large population, while important for providing a pool of labor and potential customers, is not as crucial to the location of an iron and steel industry as the availability of the necessary resources and infrastructure. Therefore, option I is not necessary for an ideal location. In conclusion, the most ideal location for an iron and steel industry is one that has an adequate supply of iron ore, a good transport network, and an adequate supply of coal. This is because these factors are essential for the production process and efficient transportation of raw materials and finished products.

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Good transport network does not promote national disintegration. In fact, it can help to promote national unity by connecting different regions and making it easier for people and goods to move between them. A good transport network promotes international trade by making it easier to move goods across borders. It also promotes the movement of people and goods within a country, making it easier for people to access goods and services and for businesses to transport their products. Furthermore, a good transport network can also promote the spread of ideas and technology, as people and information can move more easily across regions and borders. This can lead to the diffusion of knowledge and innovation, which can benefit societies as a whole. In summary, good transport networks can promote international trade, movement of people and goods, and the spread of ideas and technology, but do not promote national disintegration.

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The type of rainfall characterized by torrential downpour in the tropics or during summers in the temperature interiors is called "convectional rainfall." This type of rainfall occurs due to the heating of the Earth's surface, which causes the air to rise, cool, and condense into clouds. As the clouds continue to rise, they become saturated and precipitation occurs in the form of heavy rain, often accompanied by thunder and lightning. Convectional rainfall is common in areas with high temperatures and humidity, such as tropical regions, and is usually of short duration but high intensity.

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Cattle rearing is not a common occupation among the people of Southern coast-lands of Nigeria. This is because the Southern coast-lands of Nigeria are predominantly covered by dense tropical rainforests and mangrove swamps, which are not suitable for grazing. Additionally, the region is characterized by a high water table and periodic flooding, which makes it difficult to keep livestock. On the other hand, fishing, lumbering, and trading are common occupations in the Southern coast-lands of Nigeria. The region has a long coastline and numerous water bodies, which provide abundant opportunities for fishing. The dense forests in the region also provide opportunities for lumbering, while trading is a common occupation due to the region's proximity to the sea and the presence of several ports and markets.

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The question is asking to identify which option is NOT a benefit to be derived by ECOWAS member countries. Therefore, the answer is the option that does not provide a benefit. In this case, the answer is "territorial expansion" because ECOWAS is not about territorial expansion but rather a regional economic union aimed at promoting economic integration among its member countries. The other options, such as free movement of people, free flow of capital, and the creation of a large market, are all benefits of ECOWAS as they enhance economic cooperation, integration, and development among member countries.

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The biggest member of the solar system is the Sun. The Sun is a star located at the center of the solar system and is by far the largest object in the solar system. It contains more than 99.8% of the total mass of the solar system and is approximately 109 times bigger than the Earth. The Sun's diameter is about 1.39 million kilometers, which is more than 100 times bigger than the diameter of the Earth. Its huge mass and size make it the dominant force in the solar system, holding all the planets in orbit around it through the force of its gravity. The Sun is also the source of most of the energy that drives the Earth's climate and weather patterns. Its heat and light provide energy for life on Earth and are essential for photosynthesis in plants. Without the Sun, life on Earth would not be possible.

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Fog is not an element of climate. Climate refers to the long-term patterns of weather in a particular region, while fog is a short-term weather event that can occur in any climate. Fog is caused by the cooling of moist air, which causes water droplets to form and become suspended in the air. While fog can be influenced by climate factors such as temperature and humidity, it is not considered an element of climate itself. Rather, it is a specific type of weather event that can occur in a range of climates.

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Sima is a layer of the Earth's crust that is primarily composed of silicate minerals, such as magnesium and iron silicates. To determine its average density, we can use the formula: Density = Mass / Volume We can estimate the mass of a unit volume of sima by looking at the average density of the Earth's crust, which is around 2.7 grams per cubic centimeter. Sima is denser than the average crust, so we can assume a density of around 3.0 grams per cubic centimeter. Therefore, the answer is 3.0.

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The climate of Nigeria is characterized by two seasons: the dry season and the rainy season. The dry season usually occurs from November to March, while the rainy season takes place from April to October. During the dry season, there is very little or no rainfall, and the weather is hot and dusty. On the other hand, the rainy season is characterized by heavy rainfall, high humidity, and cooler temperatures. The amount of rainfall varies across different parts of the country, with the coastal regions receiving more rainfall than the northern regions.

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A net population growth is the surplus of birth over death plus net migration. In other words, it is the difference between the number of births and the number of deaths in a population, plus the number of people who move into the population (immigration) minus the number of people who move out of the population (emigration). This represents the overall increase in the size of the population over a given time period.

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Man has indeed interfered with the ecosystem through farming, modification of weather and climate, and overgrazing. Farming involves clearing natural vegetation for cultivation, which leads to deforestation and soil erosion. The use of fertilizers, herbicides, and pesticides also affects the soil, water, and air quality in the ecosystem. Moreover, the introduction of genetically modified organisms (GMOs) has the potential to disrupt the ecosystem balance. Modification of weather and climate through human activities such as burning of fossil fuels, industrial processes, and transportation emissions has contributed significantly to global warming and climate change. The consequences of these activities include rising sea levels, increased frequency of extreme weather events, and changes in precipitation patterns. Overgrazing involves excessive grazing of domestic animals on natural vegetation, leading to depletion of plant species and soil erosion. This, in turn, affects the food chain and the habitat of other animal species in the ecosystem. Therefore, man's interference with the ecosystem through farming, modification of weather and climate, and overgrazing has had significant negative impacts on the environment and the balance of the ecosystem. Thus, the correct option is (d) I, II, and III.