The central portion of a valley glacier moves _____ the sides.

Name: The central portion of a valley glacier moves _____ the sides.
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The central portion of a valley glacier moves faster than the sides due to a phenomenon called basal sliding. As the glacier moves downhill, the weight of the ice causes it to deform and slide over the ground, creating a lubricated surface that allows the glacier to move faster in the middle where there is more ice and pressure.

The Central Portion of a Valley Glacier Moves _____ the Sides