There are many spectacular glaciers in Prince William Sound, each one formed by numerous years of snow accumulation. In the Sound, we see a variety of different glaciers. The Alpine Glaciers (also know as mountain and cirque glaciers) can be seen high up on the slopes and plateaus of the towering mountains lining Prince William Sound. When these alpine glaciers start to overflow, they become Valley Glaciers.
A Piedmont Glacier will be formed when one or more glaciers merge into a fan-shaped ice mass at the foot of a mountain range. As the piedmont glaciers retreat, they often leave a terminal moriane behind marking the furthest distance the glacier advanced, before retreating. As the glacier continues to melt, the run off water might be trapped by the terminal moraine and eventually a lake will be created from the melting water.
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