the answers to the following questions can be found in the deserts
pages (see left hand menu).
What proportion of the Earth's surface is covered by desert ?
must the average annual rainfall not exceed in areas classified
as desert ?
What proportion of the Earth's deserts are covered by sand ?
is the most arid continent on Earth ?
two rivers cross the Sahara desert ?
African desert plant closely resembles a cactus ?
What proportion of their body weight can camels drink in one go?
How many species of plant can be found in the Sahara desert?