Earth

What color was the dust that swept the Great Plains?

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Mercurial barometers measure what?
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What is the Hawaiian name for smooth-flowing basaltic lava, often appearing twisted and rope-like?
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How long does it take for the Earth to rotate around completely on its axis?
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What direction does a compass needle point to?
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What instrument do you use to measure wind speed?
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Where are tropical zones located on the Earth?
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What breaks when its height is 3/4 of its depth?
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What is a person called who specializes in the physical structure and process of the earth?
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