At Depths of Greater Than 60 M,ice Moves by Plastic

question 20

Multiple Choice

At depths of greater than 60 m,ice moves by plastic deformation.What causes this transition from brittle to ductile behavior?

• A) A decrease in temperature causes the glacier to melt and slide.
• B) An increase in pressure increases friction and melts the ice.
• C) An increase in the pressure allows for only minute deformation.
• D) A decrease in the amount of trapped sediments allows more flow.

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