Science

What is matter that doesn't allow light to pass through called?

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Which state saw the first self-sustaining nuclear chain reaction in 1942?
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Which is the planet with the greatest average density?
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What is a sudden violent explosion on the sun called?
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The definition of "a physical unit of storage on a computer disk or tape" best fits which science term?
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Where on the moon did people first land a spacecraft?
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What is a machine capable of performing tasks automatically called?
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If you're talking about electricity, what does "DC" stand for?
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What is another name for a volt-ohm meter?
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