Earth

Which is heavier, cold air or warm air?

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What is the most photographed, painted, and scaled mountain in the world?
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Which of these is not a type of a major oil trap?
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What is the very bottom soil horizon called?
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What is an uplifted area with a flat top called?
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What are the bodies of water that surround the Earth's continents called?
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Rapidly descending air beneath a thunderstorm is what?
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What soft brown coal that has lost all of its moisture called?
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What is another name for green beryl?
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