What causes a crevasse to form?
A crevasse is a crack in the surface of a glacier caused by extensive stress within the ice. For example, extensive stress can be caused by stretching if the glacier is speeding up as it flows down the valley. Crevasses can also be caused by the ice flowing over bumps or steps in the bedrock.
What causes a crevasse to form quizlet?
What causes a crevasse to form? When ice flows around a bend or over an obstacle, it is stretched and torn, causing large cracks to form.
Where do crevasses form in glaciers quizlet?
Crevasses form on the upper portion of the glacier because when a glacier moves over irregular terrain, the zone of fracture is subjected to tension, which forms the crevasse.
What is a glacial crevasse quizlet?
Glacial Crevasses. A crevasse is a deep crack, or fracture, found in an ice sheet or glacier, as opposed to a crevice that forms in rock.
What is a crevasse and how does it form?
A crevasse is a deep crack, that forms in a glacier or ice sheet that can be a few inches across to over 40 feet. Crevasses form as a result of the movement and resulting stress associated with the shear stress generated when two semi-rigid pieces above a plastic substrate have different rates of movement.
How do crevasses form in glaciers quizlet?
when a valley glacier comes to a steep slope, cracks called crevasses form. They form because the ice near the surface of the glacier is rough and rigid. The ice responds to the movement of the ice underneath it by breaking.
What are crevasses and where do they form quizlet?
Crevasses are cracks that form in the zone of fracture at the top of the glacier. They form when tension is created as a result of the glacier moving over irregular terrain.
Why do glacial crevasses form quizlet?
when a valley glacier comes to a steep slope, cracks called crevasses form. They form because the ice near the surface of the glacier is rough and rigid. The ice responds to the movement of the ice underneath it by breaking.
Where do crevasses form in glaciers?
Crevasses usually form in the top 50 meters (160 feet) of a glacier, where the ice is brittle. Below that, a glacier is less brittle and can slide over uneven surfaces without cracking. The inflexible upper portion may split as it moves over the changing landscape.