physical geography of africa south of the sahara chapter 20
TRANSCRIPT
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Physical Geography of Africa South of the Sahara
Chapter 20
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1. The LandKnown for extraordinary physical
geographyVery diverse
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LandformsMI: Africa south of Sahara is a region of
plateaus, mountains and rift valley in eastMassive region covers 9.5 million square
miles
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The Great Rift ValleyRuns from Syria in SWA to Mozambique in SE
AfricaRift valley – large depression in Earth’s surface,
formed by tectonic plate movementVolcanic mountains at it’s edges, deep lakes Includes Mt. Kilimanjaro, one of largest mtns. in
worldLake Tanganyika, one of deepest and longest
freshwater lakes in world, lies on western branch of GRV
Lake Malawi, more than 2300 ft deep
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Mountains and PlateausSeries of plateaus, rise in elevation from
coast inlandPlateaus range in elevation from 500 ft to
8000 ftEdges lined by escarpments, steep jagged
cliffs, and cataracts, or waterfallsLargest mountains include Kilimanjaro and
Mt. Kenya
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Water SystemsMI: Landforms and physical processes have
influenced the regions water systems (lakes, waterfalls, rivers)
Lakes/rivers, located in basins, formed by tectonic activity
Rivers start at high elevations, make their way to the sea
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Land of LakesMost lakes near Great Rift Valley, E AfricaLake Victoria, largest freshwater lake in
Africa, second largest in world behind Lake Superior
Lake Chad, W. Africa, shrinking due to irrigation, desertification, global warming
Desertification – long periods of drought and land use destroy vegetation
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Human Made LakeLake Volta, W. Africa (Ghana), among
largest HM lake in the worldCreated in 1960’s by damming Volta RiverDam built for hydroelectric power in Ghana
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River BasinsNiger River, main river in W. Africa2600 miles longImportant for agriculture and
transportation in regionForms Niger Delta upon entering Atlantic
Ocean, 200 miles wideDelta – a triangular section of land formed
by sand and silt carried downriver
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River BasinsZambezi River, S. Central Africa2200 miles longHeadwater near the Zambia-Angola border,
flows to Indian OceanAt border of Zambia and Zimbabwe,
Zambezi falls 355 feet, forming Victoria Falls
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River BasinsCongo River, Central AfricaAbout 2,900 miles longReaches sea through an estuary, or
passage where freshwater meets seawater
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Natural ResourcesMI: Mineral resources and water are
among the region’s most abundant natural resources
Oil – Nigeria, Angola, Gabon, Congo and Cameroon
4 percent of world oil in Sub-Saharan Africa
South Africa – half of worlds goldUranium – South Africa, BotswanaWater is abundant, but irregular and
unpredictable, difficult to control for irrigation and hydroelectric power
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2. Climate and VegetationMI: Rain helps determine:climatevegetation growth
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Tropical Climates
Causes of variation in climate and vegetation:
rainfallocean currentsprevailing windselevationlatitude
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Tropical WetMap of p. 516TW Zone located near equatorMore than 60 inches of rain per yearProduces variety of vegetationRainforest levels:Low: ferns, moss, shrubsMid: Trees, palmsCanopy: leafy trees, max height of 150 ftSoil not fertileHeavy rains leach, or dissolve and carry
away, nutrients from soilCrops grown: bananas, pineapples, cocoa,
tea, coffee, timber, cotton
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Tropical DrySavanna, or grassland with scattered
trees, covers half of AfricaAlternating wet and dry seasons35-45 inches annual rainfallHot, dry air from Sahara, called harmattan, affects TDZone
Cool, humid air from SW affect TDZoneCombination at times forms tornadoesAnimals: zebras, gazelles, hyenas, lions,
giraffes and cheetahs
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Dry ClimatesMI: Dry climates of Sub-Saharan Africa
located in the north and south, away from the equator
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SteppeTransition zone between tropical dry
savanna and desertNorthern steppe called the Sahel, from
Senegal to Sudan4-8 inches annual rainfall
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DesertificationSahel, undergone desertification over past
50 yearsMay be caused by climate changeMay be caused by human activities, animal
grazing, logging, farming, etc.
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DesertNamib Desert, Atlantic coast of NamibiaKalahari, eastern Namibia, Botswana and
part of South AfricaDaily temps in Kalahari vary widely, from
50 dg., night, to 120 dg., day
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MidlatitudeCoastal areas of South Africa, humid
subtropical climatesHighland East Africa, moderate climates,
adequate rainfall for farming, some snow at high elevations