Glaciers

A glacier is a large flowing ice mass. Some glaciers move at a snail’s pace, just a few inches a day, while others advance more than a hundred feet a day. Glaciers are formed as large amounts of snow accumulate over many years and individual snow flakes at the bottom of the snow pile are compacted into grain-like pellets called firn. As the weight builds up, the firn are compacted even further into blue glacial ice. The glacial ice eventually becomes so thick and so heavy that it moves under the pressure of its own weight