glacial trough

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A relatively straight, steep-sided, U-shaped valley that results from glacial erosion. Its cross profile approximates to a parabola, while its long profile is often irregular, with rock bars (riegel) and over-deepened rock basins being typical features. The world's largest glacial trough is that of the Lambert Glacier, Antarctic which is 50 km wide and about 3.4 km deep.

Subjects: Earth Sciences and Geography.

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