Earth

What color was the dust that swept the Great Plains?

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How was the 12-mile limit of a country's boundary set?
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Which north direction is the geographic meridian plane?
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What process helps to break down rocks by wind, air or rain?
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What submersible helped to discover the wreckage of the Titanic in 1986?
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What is another name for fossilized resin?
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Where is the coldest place on earth?
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What is the main cause of caves?
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What is the very sticky form of clay till called?
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