Science
Which of these objects is an example of a simple machine?
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The modern equivalent of Aristotle's polis is an independent unit called what?
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Deep trenches such as the Grand Canyon were formed by what process?
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About how many days does it take for the moon to pass through all phases?
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What is the speed of the solar system around the center of the galaxy?
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Energy return of a radar signal after it has hit the target best fits which science term?
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