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Guncha Pravin from jamshedpur , asked a question
Subject: Social Science , asked on 22/11/11

why most of the worlds desert are located in the western margins of continents in the subtropics?

Ripsa Rani , From Kendriya Vidyalaya , added an answer
Answered on 22/11/11

Deserts are most common in the western margins of the continents in the tropics .

--because of the cold ocean currents along the western margin of the continents. the air that blows over the cold ocean currents becomes cold and there by the moisture is sucked , this makes the region devoid of moisture and rainfall.
--the prevailing winds in the tropics are tropical easterly winds ,the tropical easterly winds become dry by the time they reach the western margins of the continents and so they bring no rainfall.

thumbs up plz ....

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Akshita Viswan , From Gems Our Own Indian School , added an answer
Answered on 22/11/11

 Because of the "Rain Shadow" effect.

Rain shadow deserts are formed because tall mountain ranges prevent moisture-rich clouds from reaching areas on the lee, or protected side, of the range. 

As air rises over the mountain, water is precipitated and the air loses its moisture content. A desert is formed in the leeside "shadow" of the range.

When that air reaches the leeward side, it is dry because it has lost the majority of its moisture, resulting in a desert. The air then warms, expands, and blows across the desert. The warm, desiccated air takes with it any remaining moisture in the desert.

Shivi123 N , From The Air Force School , added an answer
Answered on 15/3/13

thumbs up to u "ripsa" 

thanks a lot :)

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