Science
What is water stored beneath the surface of the Earth called?
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What is the world's largest non-profit, scientific and educational organization?
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Which of these is a unit of length used in marine navigation?
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Which of the following energy sources do gardens rely on most for survival?
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What is any picture of an object made with a mirror or lens called?
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Which one of the original 7 astronauts sported the middle name of Herschel?
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