Earth

What mineral makes both sapphires and rubies when cut and polished?

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What is in the sky if it is overcast?
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What is the trapping of the sun's solar energy and radiation called?
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People who inhabit earth are known as...?
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Which of the following is a model of the earth?
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What storm is the opposite of an anticyclone?
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What is another name for layers of rock?
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Which is another name for a pudding stone?
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Which of the following lakes has a higher salt content than normal?
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