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Desertification (Erosion (The wearing away of the land by natural…
Desertification
Erosion
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Soil fertility reduced, crops fail
Sheet erosion - moderate rainfall falls on bare soil, top of slope moves downhill
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Wind erosion - arid climates, loose dry soil blown away by wind
Human Causes
Desertification - used to describe how a once productive land gradually changes into a desert-like landscape
Population increase, more fuel wood needed
More food needed - over cultivation, overgrazing
Deforestation, soil left bare, worn out
Agriculture and poverty, no fertilisers, more strain on soil
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Physical Causes
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Water table lowered, increased overland flow
Water drained and flows away from soil, dry soil blown away
Fewer plants grow, little farming possible
Bare soil, desertification
Soil Erosion
Removing vegetation, soil exposed
Overgrazing by animals, soil exposed
Overcultivating soil, crops fail, soil exposed
Compacting soil by use of heavy machinery, rainwater washes away soil
Ploughing fields in same direction as slope, encourages gullying