According to analysis of air in Greenland and Antarctic ice cores, global temperature has ____.
A)increased steadily over the past 400,000 years
B)decreased steadily over the past 400,000 years
C)increased and decreased in cycles over the past 400,000 years
D)remained stable over the past 400,000 years
E)remained stable and then increased during the past 100,000 years

Question

Quizplus · Accepted Answer

Analysis of air trapped in Greenland and Antarctic ice cores shows that global temperature has fluctuated in cycles over the past 400,000 years, with periods of warming followed by cooling. These cycles are largely driven by natural factors such as changes in the Earth's orbit and tilt, volcanic activity, and variations in greenhouse gas concentrations.

According to Analysis of Air in Greenland and Antarctic Ice