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Not all deserts are hot. They can be cold like Antarctica. But the primary reason hot deserts are hot is that lack of water. There are few clouds, plants, or soil layers to shield the surface, and no surface water to cool by evaporation. Hot rock and sand absorb the Sun's heat, then radiate it again, which is why deserts can be unbearably hot in the day and yet very cold at night.

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13y ago

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