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What determines how loud or soft a sound is?

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Halley's Comet is predicted to appear again in which year?
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Besides the V rockets for Germany, what was the most famous rocket that von Braun developed?
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What does the first "A" in NASA stand for?
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In what part of the human body is the heart found?
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Sudden, transient motion or trembling of the earth's crust best fits which science term?
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What does the word "geothermal" mean?
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What is the waxy covering on plant leaves?
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What university did astronomy and space science theorist Carl Sagan teach at?
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