Science
What was the first sound-recording device called?
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Which of these scientific terms is defined as the solid surface layer of a planet or moon?
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What are the "Big Dipper" and "Orion" examples of in the night sky?
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What fuels were formed from the decayed remains of plants and animals?
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How long does it take for Saturn to rotate completely on its axis (a typical day)?
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12.36 Microseconds is the equivalent to one unit of what?
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What is the watering of land by artificial means called?
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Deep trenches such as the Grand Canyon were formed by what process?
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