U-shaped valleys are formed by glaciers
http://wiki.answers.com/Q/Where+would+ou+find+a+U-shape...
U-shaped valleys or troughs are created by glacial erosion of a stream valley. Stream valleys are generally V-shaped.
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Most commonly a U-Shaped Valley is created where a Glacier travels down an existing V shaped Valley formed by a River in its Upper course. The Glacier literally cuts through the valley through abrasion and via the sheer force of the glacier...
http://answers.yahoo.com/question/index?qid=20090426132...
Millions of years usually. Depends on the speed of the glacier and the type of rock that the glacier forms in. Yes they are the sam thing.
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The u-shaped valley is formed by a glacier and a v-shaped valley is formed by a river. So to change from a v-shaped to a u-shaped you would a have to have a river formed valley that was then carved out by a glacier.
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In any of the mountainous regions of the world where there has been glacial movement. (Here's a few: Scotland, Scandinavia, Canada, USA, Austria, Switzerland, Ireland) "Examples of U-valleys are found are found in every mountainous reg...
http://answers.yahoo.com/question/index?qid=20091002055...
Cirques and U-shaped valleys are formed from glaciation, so none of the answers fits in here. Of your answers, B) seems to be the most likely answer, since glaciers are formed from massive amounts of ice.
http://answers.yahoo.com/question/index?qid=20081015151...