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U-shaped valleys. , or troughs, with a flat floor and steep sides. The glacier uses the processes of plucking and abrasion to widen, steepen, deepen and smooth 'V'-shaped river valleys into a 'U...
The erosive power of the glacier over deepens the valley floor. The rocks that have become embedded within the glacier scrape against the valley sides and base, and smoothen it like sandpaper.
Formation of a U-shaped valley happens over geologic time, meaning not during a human's lifespan. It can take anywhere between 10,000 and 100,000 years for a V-shaped valley to be carved into a U-shaped valley. [3] These valleys can be several thousand feet deep and tens of miles long. [1]
The valley is approx. 3000–3500 feet deep and about 7.5 miles (12 km) long. High granite summits like Half Dome and El Capitan surround it. U-shaped valleys in Yosemite National Park are seen from this well-known Half Dome rock formation where glacier paved its way through the Granite Mountains.
Learn about and revise glacial processes, including weathering, erosion, transportation and deposition, with GCSE Bitesize Geography (Edexcel).
Glacial valley, stream valley that has been glaciated, usually to a typical catenary, or U-shaped, cross section. U-shaped valleys occur in many parts of the world and are characteristic features of mountain glaciation. These glacial troughs may be several thousand feet deep and tens of miles long.
These are valleys formed by the glacial processes of weathering, erosion and transportation. They have steep sides and flat floors. Unlike V-shaped river valleys, glacial troughs are straight as they have truncated any interlocking spurs which existed prior to glacial advance.