Glacier ice has great erosive power removing ... They get cut off so while erosion makes the main valley deeper and deeper, the smaller valley is left hanging higher up above the valley floor.

Erosion transports the fragments away ... Together with advancing ice, the rocks carve out a path as the glacier slumps down the mountain. When the glacier begins to melt, it deposits its cargo ...

Ancient glaciers triggered floods that altered ocean chemistry, supporting evolving life. Scientists uncover how past events ...