Science

How many years are in a sunspot cycle?

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What fuels were formed from the decayed remains of plants and animals?
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Which bridge has the longest span in the U.S.?
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What makes up about 70 percent of most living things?
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The first vaccine targeted which disease?
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What does a reflecting telescope use to bend light?
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What university did astronomy and space science theorist Carl Sagan teach at?
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Which one of these colors is NOT part of the primary colors of light?
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Which characteristics do organisms use to help them survive in their environment?
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