Earth
What happens to the air pressure as we increase our altitude?
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What is the name for snow crystals that melt and refreeze into granular particles on glaciers?
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What submersible helped to discover the wreckage of the Titanic in 1986?
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What color was the dust that swept the Great Plains?
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Which of these is a spiral storm that can be many miles wide?
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What magnitude did the largest recorded earthquake in the United States reach?
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What is a scientist who specializes in soil and crops called?
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