Earth

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

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How long does it take for the Earth to rotate around completely on its axis?
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A 286-mph tornado ripped through what U.S. state?
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What can help farmers control erosion in their fields?
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What does a pluviometer measure?
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Which layer of Earth's atmosphere is the very edge of space?
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How many sides of a peninsula are surrounded by water?
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What are solids contained in the gas that issues from a volcano called?
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In the United States, summer officially begins in which month?
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