What caused the glacial ages?

Question

Quizplus · Accepted Answer

All of the above have contributed to the glacial ages. Changes in the atmosphere, including variations in greenhouse gases such as carbon dioxide and methane, have affected the Earth's climate. Changes in the positions of the continents have influenced ocean circulation patterns, air flow, and climate. Changes in circulation of sea water, such as changes in ocean currents, have also affected the climate. Together, these factors have contributed to the occurrence of glacial ages.

What Caused the Glacial Ages