Earth

Which is heavier, cold air or warm air?

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Who first charted the Gulf Stream?
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What polluting material can choke an animal by getting caught around its neck?
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What famed rock is 1396 feet high, 2.75 miles long, and .25 miles wide?
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What is the highest mountain, considering just the contiguous United States?
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In the U.S., the spring equinox occurs in what month?
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Which of these is not a type of coral-reef shoreline?
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What is the study of atmospheric conditions and climate called?
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Where in Arizona is the sun blocked 10% of the time?
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