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Glaciers can form U shaped valleys.
Look at the shape of the valleys. If they are V-shaped there were no valley glaciers; if they are U-shaped there were.
Glaciers form U-shaped valleys. They make striations, drumlins, kettlelakes, eratics, moraines and cirque.
Yes. Look at any glacial (u-shaped) valley and the terminal moraine at the end where the glacier melts.