The most important environmental resource that sustains natural processes in an ecosystem is

Iron deposits are found in economic quantities in?

The leading rubber producing areas of the world are?

Which of the following countries is one of the major producers of petroleum and also a net importer of the product?

The cheapest means of transport for long distance travel is by?

From which of the following lakes in Africa did the emission of toxic gas lead to the death of a large number of people in 1986?

The current world population is estimated at about

One of the the main reasons for the formation Economic Community of West Africa States is to?

The low level mechanized agriculture in West Africa is best explained by the?