Dynamic Planet/Glaciers

A glacier is a large body of ice. They originate on land, but can flow into the sea. They are made by an accumulation of ice and snow. Glaciers can leave many unique landscapes in their trail, including the formation of new lakes. The deposited material a glacier leaves are called "moraines". The front of a traveling glacier is called the "glacier head" while the back is called the "terminus. On earth, 99% of glacier ice is found in the polar regions.

Take a look here: http://en.wikipedia.org/wiki/Glacier