(b) Importance of crude oil to the economy of Nigeria;
(i) Crude oil provides essential products like petrol and kerosine
(ii) It provides employment to Nigerians
(iii) It also provides raw materials for industries
(iv) It provides foreign exchange for the nation
(v) Provision of infrastructure like pipe borne water, good roads, electricity, etc
(c) Four problems facing the mining industry in Nigeria include;
(i) Environmental pollution
(ii) It leads to loss of farmlands
(iii) Lack of skilled labour
(iv) Inadequate transport facilities