Question

what shape valley is formed from glaciers

Answer 1

Valley glaciers are streams of flowing ice that are confined by steep walled valleys, often following the course of an ancient river valley. They usually form from Cirques, where the glacier overspills the hollow and begins to travel down the valley. Alternatively, they may form branching off from an ice sheet. The downward erosive action of the ice carves a U shaped valley, as opposed to a V shaped valley for rivers. They have a lot of erosive potential as they are thick bodies of ice exerting extreme amounts of pressure. Valley glaciers 'choose' the most accessible route and erode and enlarge the area. It uses erosional processes, plucking and abrasion. Due to the size and nature of the glacier it can pick up large amounts of debris and scree and deposits it as moraine.

Answer 2

http://en.wikipedia.org/wiki/U-shaped_valley