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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Related Book For  answer-question

The Physical Universe

ISBN: 978-0077862619

16th edition

Authors: Konrad B Krauskopf, Arthur Beiser

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