ECOLOGY
ENVIRONMENTAL ISSUES
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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years of uncontrolled flooding
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overuse of the land by the people
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heavy seasonal winds coming off the desert
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sharp and unexpected changes in the climate
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Detailed explanation-1: -Farmers can also allow livestock to overgraze the land and reduce vegetation. They may also overuse local water supplies and contribute to the soil drying.
Detailed explanation-2: -’Climatic variations’ and ‘Human activities’ can be regarded as the two main causes of desertification. removal of the natural vegetation coverby taking too much fuel wood, agricultural activities in the vulnerable ecosystems of arid and semi-arid areas, which are thus strained beyond their capacity.
Detailed explanation-3: -Human activities that contribute to desertification include the expansion and intensive use of agricultural lands, poor irrigation practices, deforestation, and overgrazing.
Detailed explanation-4: -Overgrazing is an important reason for desertification. Overgrazing denudes the soil of plant cover. Trampling by cattle decreases soil porosity. The exposed hardened soil undergoes erosion by wind and water.
Detailed explanation-5: -Land degradation is caused by multiple forces, including extreme weather conditions, particularly drought. It is also caused by human activities that pollute or degrade the quality of soils and land utility.