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solar cycle

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noun Astronomy.
the variation of sunspots, prominences, flares, and other solar activity through an 11-year cycle.
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QUIZ YOURSELF ON OPPOSITES OF RED BEFORE YOU TURN SCARLET
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Which of the following colors is used to symbolize AIR?
Also called solar activity cycle.
Compare sunspot cycle.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2022

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