In 1610, shortly after viewing the sun with his new telescope, Galileo Galilei made the first European observations of sunspots and continuous daily observations were started at the Zurich Observatory in 1849. The graph represents the sunspot count over the last several decades. Based on the sunspot tallies, what comment can you make about their occurrence?
A Sunspot numbers rise and fall cyclically.Sunspot numbers rise and fall cyclically.
B The number of sunspots has been declining over the decades.The number of sunspots has been declining over the decades.
C Sunspot numbers reach their peak every five years.Sunspot numbers reach their peak every five years.
D The number of sunspots remains constant over time.


second Margot and her family were traveling through the mountains on fall break. Without warning everyone's cell phone stopped working. They could not listen to the car radio because of static and then they got lost! The GPS in the car stopped working. Margot's mother said: "It's a solar flare! The same thing happened to us when you were a little girl, Margot." "When was that?" Margot asked. Her mother could not remember. Help her out. When was the last solar flare that impacted radio communications on Earth?
Responses
A 2008-2009
B 1998-1999
C 2014-2015
D 2005