While glaciers are often seen as destructive forces, their role during the Cryogenian was more complex ... The Role Of Volcanic Activity In Ending The Ice Age Although glaciers dominated Earth ...

From pole to equator, the sphere is covered in a thick crust of ice. In orbit around the white planet is a single cratered moon. You are gazing on Earth in the Cryogenian period, 700 million years ...

About 700 million years ago, enormous glaciers flowed across the Earth's surface in powerful frozen rivers like "giant ice bulldozers ... in rocks from Earth's Cryogenian period.