Theory question 206
Environmental Hazards and ConservationDescribe desert encroachment under the following headings (a) causes (b) areas liable (c) effect (d) methods of prevention
Show the model answer
Model answer
(a) Long droughts and low rainfall; overgrazing; deforestation and fuelwood cutting; bush burning; over-cultivation; climate change.
(b) Sahel belt bordering the Sahara (northern Nigeria: Sokoto, Katsina, Kano, Borno, Yobe; Niger, Chad, Mali); edges of the Kalahari.
(c) Loss of farmland and pasture; loss of vegetation and wildlife; drying of rivers and lakes; famine; migration of people; sandstorms and buried settlements.
(d) Afforestation and shelter belts; controlled grazing; laws against bush burning and tree felling; irrigation and water conservation; alternative fuels; public education.
Explanation
Use the four headings in order.