However, as the glacier begins to move down the V-shaped valley the tremendous forces of the ice carve away the sides and floor of the valley and transform the V-shape into a U-shape.
(the glacier; begins; ) (the glacier; to move; down; the V-shaped valley) (the tremendous forces of the ice; carve; away; the sides and floor of the valley; T:as the glacier begins to move down the V-shaped valley) (the tremendous forces of the ice; transform; the V-shape; into a U-shape; T:as the glacier begins to move down the V-shaped valley)
the glacier the glacier the tremendous forces of the ice the tremendous forces of the ice
begins to move carve transform
down the V-shaped valley
away the sides and floor of the valley T:as the glacier begins to move down the V-shaped valley
the V-shape into a U-shape T:as the glacier begins to move down the V-shaped valley