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Deserts are formed by weathering processes as large variations in temperature between day and night put strains on the rocks, which consequently break in pieces.
A desert forms when there has been a shortage of rain for long time. It may have different geological conformation - mainly due to the effect of the wind ( wind erosion ). There are sand deserts, called erg., rock deserts, called hammada, & pebble deserts, the serir
Deserts form in many ways. One way is when rains clouds are carried by winds into the high mountains. Condensation takes place later, and rain drops down on that area of the mountain, rendering the other side without rain. The side of the mountain without rain is known as the rain shadow and is characterized by very little humidity.