Describe desert encroachment under the following headings (a) causes (b) areas liable (c) effect (d) methods of prevention
Explanation
(a) Causes of desert encroachment; (i) Prolonged drought (ii) Over grazing (iii) Deforestation or uncontrolled tree felling (iv) Bush burning (b) Areas liable: (I) Desert margins e.g sahel regions (ii) Sudan Savannah, e.g Sokoto, Maiducuri (iii) Extreme northern part of Nigeria (c) Effects; (i) Loss of vegetation (ii) Changes in climate of the areas (iii) Loss of agricultural land (iv) Loss of animals and humans by death (d) Methods of preservation: (i) Afforestation i.e planting of trees (ii) Controlled grazing (iii) Controlled tree felling/deforestation (iv) Controlled or legislation against bush burning