Earth
What is the hardest mineral known on Earth called?
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What are mounds of sand that have been windblown called?
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What name is used specifically to describe the region around the South Pole?
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What was the Great Plains of the U.S. called in the 1930's because of erosion?
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How many days a year is the sun invisible at the North Pole?
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What weather-related term comes from Greek words for "high in the sky" and "knowledge"?
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What natural disaster is said to be 100 times greater than an atomic bomb?
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