Earth

What causes the sound in a seashell?

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What instrument measures altitude?
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What is a scientist who specializes in soil and crops called?
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What line is at 0 degrees latitude?
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Where is the type location for the Permian Period?
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How many days a year is the sun invisible at the North Pole?
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What is the name of the submerged fringe of a continent?
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What is the main cause of caves?
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People who inhabit earth are known as...?
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