Science
What is the repeated sound when sound waves bounce off other objects called?
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When did Panama move from South America to North America?
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Which Apollo mission was launched on December 21, 1968, and spent Christmas in lunar orbit?
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Which aeronautical term is a moveable surface on an aircraft which controls its motion?
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Sudden, transient motion or trembling of the earth's crust best fits which science term?
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What is the part of a plant that serves primarily as the plant's food-making organ?
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What are the huge storms that the sun produces called?
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What type of object does the "no-hair" theory describe?
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