Earth

What color was the dust that swept the Great Plains?

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What type of glaciers fill up the gaps between mountains?
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What is mining near the Earth's surface called?
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Which one of these is most alkali?
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How many days a year is the sun invisible at the North Pole?
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How many miles long is an average bolt of lightning?
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What is the name of the submerged fringe of a continent?
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What was the most common type of rock to be found during the Precambrian Period?
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What does granite become when put under heat and pressure?
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