Science
Deep trenches such as the Grand Canyon were formed by what process?
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What is the rhythmic repetition surrounding the planetary day called?
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Which of these is defined as "part of the electromagnetic spectrum that contains visible light"?
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How many tons of meteor dust fall to Earth every day?
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If you're talking about electricity, what does "DC" stand for?
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When a dog repeats a learned behavior and gets a reward, what process is shown?
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