(a) On an outline map of Nigeria, locate and name (i) one inland drainage basin (ii) three rivers that flow into the basin (iii) the Bight of Benin and Bight of Bonny (iv) the Idanre Hill, Oban Hills and Biu plateau (b) Account for the shallowness of the rivers and the lake of the inland drainage basin (c) Describe any four benefits of the lake.
Explanation
(b) Reasons for the shallowness of rivers and lakes of the inland drainage basin are: (i) Water from these rivers always flows into Lake Chad without flowing out (ii) Silt and other weathered rock materials continue to drop into the lakes (iii) There is the high evaporation of water in the rivers and the lakes. (c) Four benefits of the lake include: (i) For irrigation purposes (ii) For fishing (iii) For transportation of goods and people (iv) For domestic and industrial uses, e.g drinking
