Sunspot activity tends to follow a cycle of roughly:
A)500 years.
B)100 years.
C)30 years.
D)11 years.
E)26,000 years.

Question

Quizplus · Accepted Answer

Sunspot activity follows a cycle of roughly 11 years, which is known as the solar cycle. This cycle is characterized by an increase in the number of sunspots and solar flares, followed by a decrease in activity. This cycle has been observed and studied for over 400 years.

Sunspot Activity Tends to Follow a Cycle of Roughly