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with glaciation. True glacial valleys are those that have been cut by a glacier which may or may not still occupy the valley at the present day. Such valleys may also be known as glacial troughs. They typically have a U-shaped cross-section and are characteristic landforms of mountain areas where glaciation has occurred or continues to take place. This parabola shape is caused by glacial erosion removing the contact surfaces with greatest resistance to flow, and the resulting

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