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Rain Shadow DesertsSome deserts form because they are close to mountains -these are known as "rain shadow deserts." Air masses have to rise to go over mountains - as the air masses rise, they cool. Because they are cooler, they canīt hold as much water, so it rains. Then the air, now dry, continues over the mountain to the other side. Dry air doesnīt bring rain, so a desert forms on the far side of the mountains.
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