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 
 

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