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[edit] Glacial Trough

When glaciers move downhill, they tend to follow the easiest route. In most cases they follow an existing river valley. Unlike a river, however, they fill the entire valley and their power to erode is much greater. This means that instead of having to wind around obstacles like a river, the glaciers can follow a more direct route. The result of this is that the valley is widened, deepened and straightened. The V-shaped valley of the river valley is changed into a U-shaped glacial trough. A Glacial trough is a straight, trench-like valley with a wide, flat floor and steep sides.

[edit] See also

• Playfair's Law