Earth
What mineral makes both sapphires and rubies when cut and polished?
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In weather terms, what does the Fujita scale classify?
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What's the name for the weight of air pushing down on Earth's surface?
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What theory proposes that Earth is made of plates that move?
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Advection, freezing and radiation are types of what weather phenomenon?
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Galileo was a 17th century astronomer famous for discovering that the Earth did what?
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What is another name for permanently frozen ground?
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Approximately what fraction of the Earth's air is made up of oxygen?
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