Science
What tool do people at sea use to measure distance with echoes?
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What is the potential energy in the nucleus of an atom called?
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What is magma, which has surfaced through a volcanic eruption?
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What two animals are found on the Australian Coat of Arms?
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Plato thought the Lost Island of Atlantis was linked to which ancient culture?
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Who discovered the supernova and was the first to theorize that stars "die"?
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What trees located in California are the tallest trees in the world?
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Which term describes flying at six times the speed of sound?
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