Earth

Which is heavier, cold air or warm air?

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What do we call rain-giving clouds?
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Which mineral is not likely to be a replacement mineral in fossils?
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Which of these is the longest river in the world?
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What is the name of the submerged fringe of a continent?
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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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Where do hurricanes form?
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What is the largest natural carbon sink on earth?
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What destructive event can happen when it rains for a long period of time?
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