A very important advantages of road over railways in Africa is that

The earth rotates on its axis from

Granite rocks contain

Denudation involves

In the desert region the most prominent agent of erosion is

The solar system comprises the sun and

The outer layer of the earth is called the

The planet with rights of circular light and dark bands is the

The longitude of London is 00 while that of Sydney,Australia is about 1500E. The time at Sydney would therefore be