The most important method of mining tin in Nigeria is the

A. shaft

B. open cast

C. drilling

D. adit

One characteristic of intensive farming is that it is usually practiced in urban centres with

A. inadequate water supply

B. large population

C. low population

D. mineral deposits

Trade among West African countries is low mainly because they

A. are generally poor

B. have different currencies

C. produce different goods

D. produce similar goods

In which of the following order is copper produced?

A. blasting-crushing-floating-smelting

B. blasting-crushing-floting-grinding-smelting

C. blasting-crushing-grinding-floting-smelting

D. crushing-blasting-grinding-smelting-floting

The major difference between the tropical rain-forest and savanna vegetation

A. and the rain-forest never occur on the same continent

B. is natural while the rain-forest is derived

C. grows in layers while the rain-forest does not

D. has less spcies of plants while the rain-forest has diverse species of plants

The vegetation type characterized by short grasses and stunted tress is the

A. warm temperature grassland

B. sudan savanna

C. guinea savanna

D. cool temperature grassland

Which of the following is not a cause of desertification in West Africa?

A. constant high temperature

B. deforestation

C. overcultivation

D. overgrazing

The most critical element in an ecosystem is the

A. growth per day

B. energy flow within the system

C. number of organism in the system

D. location of the system

The most important cash crop grown in the Nile Basin is

A. berley

B. cotton

C. groundunt

D. sugar cane

The leading producer of diamond in Africa is

A. zaira (Democratic Republic of Congo)

B. Nigeria

C. Tanzania

D. The Gambia