(a) Draw an outline map of Nigeria
On the map show and name:

(i) one area affected by desert enchroachment;
(ii) one town in the area named in (a) (i) above;
(iii) one crop mainly cultivated in the area named in (a) (i) above.

(b) Outline any four causes of desert enchroachment in the area named in (a) (i) above.

(c) Highlight any three ways of combating desert enchroachment in the area shown in 6 (a) (i) above.