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18 July, 13:53

Which of these follows a cyclical pattern?

A. sunspot maxima and minima

B. condensation of a nebula

C. formation of a crater

D. formation of a black hole

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  1. 18 July, 15:31
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    The number of sunspots, observed during the past 300 years or so,

    has been found to vary up and down in a cycle of very very roughly

    about 11 years.
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