(a)
(b) Physical characteristics of Niger-Benue Trough;
(i) It is a low lying area.
(ii) It is a land generally below 300m above the sea level.
(iii) It is an area characterised by extensive flood plains and swamps.
(iv) Climate is tropical hinterland/ continental.
(v) Rainfall within the area is more than 120cm.
(vi) Humidity is above 70% for most parts of the year.

(vii) Vegetation is Guinea Savanna.
(viii) Major rivers that run to both areas, are River Niger, Benue, Donga, Kaduna, Sokoto, Gongola, etc.
(ix) The rocks are made up of older sedimentary rocks with flat hills separated from one another gorge- like river valley.
(c) Relationship between physical characteristics and economic activities.
(i) Presence c' rivers encourage irrigation.
(ii) Moderate rainfall encourages farming for food crops such as rice, yams, soyabeans etc.
(iii) Presence of rivers encourages fishing and inland water transport.
(iv) Presence of limestone has led to cement industry.
(v) Presence of rivers has led to boat building and power generation at Kainji.
(vi) Sedimentary deposits have led to exploitation of salt.
(vii) Presence of clay deposits promotes pottery.
(viii) Presence of swamps encourages rice cultivation. 2 15°W 20°E