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Discussion :: Miscellaneous World Geography

  1. Sunspots generally wax and wane over a/an

    2. A.

     11-year cycle
    B.

     25-year cycle
    C.

     3-year cycle
    D.

     15-year cycle

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    Answer : Option A

    Explanation :

    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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