U-shaped mountains that may contain rocks that have been polished or have near scratches are formed by glacial erosion.
Glacial erosion occurs due to the fact that melt water would find their way to be under the cracks that are in a rock. Due to the fact that the water would freeze, it would cause the rock to push out.
Glacial lakes would form due to glaciers that begin to melt after they have been formed in a particular place overtime.
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