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

Question

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Glaciers that move via basal sliding are those that have minimal frictional contact with bedrock. This means that they can undergo surges in which they move at a much faster rate than normal, as the lack of friction allows them to easily slide over the bedrock. Choices A and D are incorrect, as plastic deformation and volume do not play a significant role in the occurrence of surges. Choice B is incorrect, as glaciers do not float on a cushion of air like avalanches.

Glaciers That Move Via Basal Sliding Can Often Undergo Surges