Science

What scientist discovered that sunspots occur in an eleven-year cycle?

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When cool or cold air suddenly drops to the ground, it is known as a what?
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What liquid is used as a standard when measuring density?
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Which of these is a unit of length used in marine navigation?
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Energy return of a radar signal after it has hit the target best fits which science term?
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What is the reproductive organ of most seed-bearing plants?
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What season is between winter and summer?
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At which angle should a cannon be aimed to maximize distance?
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What must occur for electricity to flow?
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