The number of sunspots a. Remains approximately constant b. Increases and decreases at random intervals c. Increases

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The number of sunspots
a. Remains approximately constant
b. Increases and decreases at random intervals
c. Increases and decreases in a yearly cycle
d. Increases and decreases in an 11-year cycle

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The Physical Universe

ISBN: 978-0077862619

16th edition

Authors: Konrad B Krauskopf, Arthur Beiser

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