Earth

What is the hardest mineral known on Earth called?

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What percentage of the earth's water is drinkable?
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Which layer of Earth's atmosphere is the very edge of space?
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What is amber?
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What instrument measures water vapor in the atmosphere?
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What are the fastest and strongest global winds called?
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What is the area on one side of a mountain that receives little rain called?
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What is the coldest, windiest and driest place on Earth?
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What are Earth's seven large land masses called?
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