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Sunspots generally wax and wane over a an

This question belongs to Geography Miscellaneous World Geography
Miscellaneous World Geography
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Sunspots generally wax and wane over a/an

Answer & Solution
Correct Answer: Option A
Sunspots generally wax and wane over an 11-year cycle. Centuries of observations have shown that the number of sunspots waxes and wanes over a roughly 11-year period. Sunspots exhibit other predictable behavior.
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