Earth

What is the name of any body of igneous rock named for the Roman god of the underworld?

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What is an underwater boat with its own power and air supply called?
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Broken river ice stuck in a narrow channel causes what?
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What direction does a compass needle point to?
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The coldest recorded temperature on Earth, -128 degrees F., was taken where?
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What word means to degrade naturally?
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What chamber do divers go into to prevent a diving sickness called "the bends"?
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What is the low pressure area along the equator called?
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What front results when a cold front takes the area of a warm front?
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