The ebb and flow of ice sheets, the warming and cooling of the global climate has profoundly shaped the history of life on Earth. They are known to be caused by slight changes in the planet's orbit or angle of rotation. Find out how America has been sculpted by glaciers so large they shear off mountains or carve immense valleys. How long have they lasted and when will Earth endure another?
The ebb and flow of ice sheets, the warming and cooling of the global climate has profoundly shaped the history of life on Earth. They are known to be caused by slight changes in the planet's orbit or angle of rotation. Find out how America has been sculpted by glaciers so large they shear off mountains or carve immense valleys. How long have they lasted and when will Earth endure another?
