Science
Deep trenches such as the Grand Canyon were formed by what process?
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What does one call a smaller stream that parallels a larger stream and finally enters the larger stream?
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What tool do people at sea use to measure distance with echoes?
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Awarded the Nobel Prize in 1977, John H. Van Vleck's area of expertise is in what?
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How many tons of meteor dust fall to Earth every day?
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Which Pioneer spacecraft first visited the planet Saturn?
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