(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 (...

 (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.