Before glaciation,tributaries joined their rivers via smaller river valleys. During the glacial period, snow and ice accumulates in the small and major river valleys, forming valley glaciers. More snow accumulates in the main river valley. It is added to by smaller tributary glaciers that have formed in the small river valleys. Due to its weight and size, the main glacier erodes its valley by plucking and abrasion, much faster than the smaller glaciers, deepening and widening it. When the glaciers melt, they reveal the main valley as a deep, wide, extensive, steep sided valley, called a glacial trough or U-shaped valley.
maurice.mutuku answered the question on June 8, 2017 at 08:31
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