Why are most deserts located at western margins s?
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Most of the worlds desertsare located in the western margins of continents in the subtropics because 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.
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Most of the tropical deserts are limited to the western margins of the continents because of the following reasons:
1) The hot deserts are mainly located in the trade wind belt. The on shore trade winds bring rain to the eastern margins of the continents. By the time they cross the interior and reach the western parts of the continents, they are totally exhausted and become practically dry.
2) The trade winds blow off shore on the western margins of the continents.
3) The western margins of the continents have high mountains which block the moisture laden winds. So, the winds drop moisture in the eastern part of the mountains or in the windward side, whereas, the western margins remain dry .
e.g. Arizona Desert - leeward side of the Rockies in North America.
Atacama Desert - leeward side of the Andes in South America.
4) The cold ocean currents flowing along the western coast of continents make the coastal areas cooler and dryer than they would otherwise be.
5) The cool winds blowing from sea to land can not pick up moisture to drop in the adjoining areas.
e.g. The cold Peruvian Current which flows near the Atacama Desert ( western coastal areas of South America)
The Benguela Current which flows near the Kalahari Desert ( western coastal areas of Africa)
However, Sahara Desert is an exception which extends right across the continent because of the presence of a large land mass i.e. Asia towards it's east. So winds can not bring moisture due to the absence of large water bodies.
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1) The hot deserts are mainly located in the trade wind belt. The on shore trade winds bring rain to the eastern margins of the continents. By the time they cross the interior and reach the western parts of the continents, they are totally exhausted and become practically dry.
2) The trade winds blow off shore on the western margins of the continents.
3) The western margins of the continents have high mountains which block the moisture laden winds. So, the winds drop moisture in the eastern part of the mountains or in the windward side, whereas, the western margins remain dry .
e.g. Arizona Desert - leeward side of the Rockies in North America.
Atacama Desert - leeward side of the Andes in South America.
4) The cold ocean currents flowing along the western coast of continents make the coastal areas cooler and dryer than they would otherwise be.
5) The cool winds blowing from sea to land can not pick up moisture to drop in the adjoining areas.
e.g. The cold Peruvian Current which flows near the Atacama Desert ( western coastal areas of South America)
The Benguela Current which flows near the Kalahari Desert ( western coastal areas of Africa)
However, Sahara Desert is an exception which extends right across the continent because of the presence of a large land mass i.e. Asia towards it's east. So winds can not bring moisture due to the absence of large water bodies.
Hope it helps you........Plz mark it Brainliest
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