Earth

Which is heavier, cold air or warm air?

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What is the weather phenomenon known as a "tsunami"?
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What is the length, in miles, of the San Andreas Fault?
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Which unit measures atmospheric pressure?
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Which volcano in Iceland was once thought to be a gateway to the underworld?
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What word means a mild or moderate temperature?
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Groundhog Day predicts how long what will last?
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What is hail made of?
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Earth's crust is made of many pieces called ______ plates.
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