Science

What is matter that allows light to pass through called?

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What type of simple machine is used on a flag and flag pole?
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What is the only joint of the body with 360 degrees of rotation?
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What would you call a statement of expected future occurrences?
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What is a slang term for tornado?
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What scientist discovered that sunspots occur in an eleven-year cycle?
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What liquid is used as a standard when measuring density?
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The process by which plants make food is called what?
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Who is regarded as the man who invented the telephone?
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