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The Hadley Cell affects temperatures in the desert because air rises, cools and condenses over the rainforests at 0° and warm dry air descends over the tropics because the moisture has been used up. Deserts are usually found at the tropics in rain shadows. Rain shadows are areas on the other side of a mountain, or an area of high ground, where there is no relief rainfall. Warm moist air rises, cools and condenses over the mountain so it rains at the top, and dry warm air descends on the other side. There is no moisture left, and so there is no rain. This area is called a rain shadow, and this is where deserts usually are. The atmosphere contains little humidity to block the Sun's rays and desert surfaces receive a little more than twice the solar radiation received by humid regions.

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12y ago

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