One major problem of development in the Niger-Benue trough is

The sparse population in the Amazon Basin is best explained by the

Which of the following represents an urban-rural migration?

A rapid population growth in a region can be caused by

One danger about the present rate of increase in world population is

A rural settlement is a settlement classified by

The greatest problem in the use of solar energy is

The vegetation belt associated with valuable hard wood is the

Temperate grasslands are generally important for