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A desert is defined by how little falls on it rather than by heat, so Antarctica is one.

Earth Science Facts, sourced to NASA.

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The usual line is drawn at around twenty five centimeters of precipitation a year. That puts the Sahara and the interior of Antarctica in the same category, which sounds like a technicality and is not: both are shaped by the same shortage. Sand covers only a small fraction of the world's deserts. The rest is gravel, bare rock and salt flat, because without water there is little to break rock down into sand and nothing to hold it.

The claim comes from NASA.

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