Earth
What is the hardest mineral known on Earth called?
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How long does it take for the Earth to rotate around completely on its axis?
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In which U.S. state was the prehistoric proglacial lake Glacial Lake Missoula located?
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Yosemite National Park is an easily recognizable part of what batholiths?
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Which layer of Earth's atmosphere is the very edge of space?
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Which of these terms can be used to describe steam?
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What plant's gel is often used in lotions and sunblocks?
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