Science

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

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What is a process used by plants to convert light energy into chemical energy?
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What must occur for electricity to flow?
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The science term "precipitation" is best defined as which of these?
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What is a slang term for tornado?
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What space object did some ancient cultures rely on to tell the passage of time?
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What is the Beaufort scale used to measure?
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When a dog repeats a learned behavior and gets a reward, what process is shown?
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How many rings does the planet Saturn have?
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