Earth
What periods of the Earth's history had glaciers covering a lot of the Earth?
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What is the name of any body of igneous rock named for the Roman god of the underworld?
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What periods of the Earth's history had glaciers covering a lot of the Earth?
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What process helps to break down rocks by wind, air or rain?
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What is the length, in miles, of the San Andreas Fault?
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What plant's gel is often used in lotions and sunblocks?
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What is the test that can help determine the hardness of a rock called?
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