| 1. | Temperature changes in polar deserts frequently cross the freezing point of water.
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| 2. | Northern portions of the region include polar desert, taiga and tundra biomes.
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| 3. | Polar deserts cover much of the ice-free areas of the Arctic and Antarctic.
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| 4. | Severnaya Zemlya is a polar desert with sparse vegetation and permafrost at less than.
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| 5. | Most of the interior of Antarctica is polar desert, despite the thick ice cover.
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| 6. | Is it possible for a hypothetical planet to have polar deserts instead of ice caps?
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| 7. | Polar deserts on Earth cover nearly 5 million square kilometers and are mostly hard bedrock or gravel plains.
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| 8. | Biomes include tropical rainforest, temperate broadleaf and mixed forest, temperate deciduous forest, taiga, tundra, hot desert, and polar desert.
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| 9. | Devon Island is a polar desert with a meteorite impact crater that has a geology very similar to Mars.
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| 10. | Imre Friedmann, director of the Polar Desert Research Center at Florida State University, said the study excludes the surrounding mountains.
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