A soft, black opaque carbonaceous rock that can be used to make pencils is

An environmental hazard which occurs slowly and unnoticed in the oil-producing region of the Niger Delta of Nigeria is

The prosperity of Kenya depends upon the cultivation of

The technique that would produce the most accurate contoured map of a small area is

From its source to its mouth, the River Niger passes through

An important mineral deposit in South Africa which has attracted a large number of white settlers is

One basic mineral that is common to Sokoto, Ewekoro, Calabar and Nkalagu is

In Nigeria, continentality poses the greatest hindrance to economic development in the

In Nigeria, the dominant trees of the Guinea Savannah include