Earth

What produces more energy than all the world's nuclear weapons combined?

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What is the test that can help determine the hardness of a rock called?
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Which volcano in Iceland was once thought to be a gateway to the underworld?
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What is moving air called?
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What is the weather phenomenon known as a "tsunami"?
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What does a konimeter measure?
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Al Gore made a film about what climate issue?
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If the beach loses 3 feet of sand each year, how many feet will it lose in 15 years?
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What does the term "geocentric" mean?
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