Sunspot activity

Question

Sunspot activity

Quizplus · Accepted Answer

Sunspot activity typically varies in number on a roughly eleven-year cycle. This is a well-known phenomenon that has been studied for more than a century.

Answer: B and C are incorrect.
 Sunspot activity was first observed in the early 17th century by Galileo, not in the late nineteenth century. Also, sunspot activity does not typically have the same number of sunspots per year, as it fluctuates on an eleven-year cycle.

Answer: D is incorrect.
 While there is some evidence of a correlation between sunspot activity and climate changes, this relationship is still an ongoing area of research and has not been conclusively proven.

Sunspot Activity