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

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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 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.

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thumbs up to u "ripsa" 

thanks a lot :)

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1. Trade winds are of shore in western side of the continent because it has downpoured, moisture it picked from water body ,on the eastern side . 2. Presence of the continents cause dessicating effect.
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The western margin of the tropical region is under the influence of offshore winds which blow form the interior of the continents due to this the region receives scanty rainfall which makes it a desert
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