Science

What does a ruler measure?

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What space object did some ancient cultures rely on to tell the passage of time?
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Transfer of heat through a substance by molecular action best fits which science term?
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What is another name for a "shadow clock"?
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A very fast white water cascade is also known as what?
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Who discovered the supernova and was the first to theorize that stars "die"?
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What is the substance that gives plants their green color?
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Which of the following terms is not related to thermodynamics?
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What was the name of the first artificial satellite launched into space?
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