Earth

What is amber?

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What happens to the air pressure as we increase our altitude?
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How many moons does Earth have?
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What is the process of a river washing away its riverbanks called?
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What was the Great Plains of the U.S. called in the 1930's because of erosion?
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What is the highest mountain, considering just the contiguous United States?
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What is the area filled with groundwater called?
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What is another name for the "Humboldt Current"?
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What are mounds of sand that have been windblown called?
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