Glaciers That Move Via Basal Sliding Can Often Undergo Surges

question 54

Multiple Choice

Glaciers that move via basal sliding can often undergo surges in which they move at a much faster rate than normal because they ________.

• A)are not slowed down by plastic deformation
• B)float on a cushion of air like avalanches
• C)have minimal frictional contact with bedrock
• D)have a larger volume than other glaciers

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