Earth

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

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What are the pilots who guide ship captains to docking areas safely called?
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Which of these types of pollution occurs naturally?
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What is a meteoroid called if it lands on the Earth's surface?
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What branch of science deals with fossils of living things?
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A scientist that studies the Earth's surface is called what?
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Which of these is a body of salt water?
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From which does the Global Positioning System receive its information?
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What is the driest U.S. state?
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