Earth
What is the name of any body of igneous rock named for the Roman god of the underworld?
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What type of rock forms from melted rock and comes to the surface to harden?
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Which of these is the first step in the making of a fossil?
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What is the theory that describes how the continents got where they are today?
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Which of these African watersheds is the largest in size?
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What is the most photographed, painted, and scaled mountain in the world?
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What is an underwater boat with its own power and air supply called?
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In the United States, summer officially begins in which month?
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