(a) (i) On an outline map of Nigeria, show the area that is mostly affected by desert encroachment
(ii) Locate an name two important towns within the area
(b) Describe the major causes of desertification
(c) Explain two possible ways of combating this hazard.
(b) Major causes of desertification include:
(i) Shifting of climatic zones e.g natural shifting or encroachment of the Sahara Desert towards the North estimated to be 50km per year
(ii) Climatic variations - very low rainfall
(iii) Human activities such as deforestation and overgrazing
(c) Two possible ways of combating desert encroachment include:
(i) Large scale irrigation system - This will enable water to be available in the soil and consequently promote the growth of vegetation in the area.
(ii) Afforestation - This involves the planting of trees which act as barriers to the speed of winds carrying sand from the desert
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