Science
What tool do people at sea use to measure distance with echoes?
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At which angle should a cannon be aimed to maximize distance?
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Which of these is one of the three basic cloud forms?
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What specifically is a bezoar called those results from persimmon ingestion?
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What is water stored beneath the surface of the Earth called?
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What is the only joint of the body with 360 degrees of rotation?
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Who was the first President of the "Planetary Society", an organization of amateur astronomers?
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