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What is the most common element in Earth's atmosphere?
Earth
What is the most common element in Earth's atmosphere?
Helium
Nitrogen
Hydrogen
Argon
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Which of these is a body of salt water?
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What is the top layer of the soil called?
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What is the name of the reddish soils of the humid tropics?
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What kind of waves does an earthquake produce?
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What is the tendency of Earth's rotation to turn winds called?
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Which of these is not a type of coral-reef shoreline?
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Broken river ice stuck in a narrow channel causes what?
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What is the best definition of the term "rock"?
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