Last updated on April 21, 2014 at 12:45 EDT
Glacier Shear Margin
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Glacier Shear Margin

December 20, 2012
View of a glacier shear margin seen from the NASA DC-8 on the Nov. 1 survey of the Ronne Ice Shelf grounding line. A shear margin is the point where fast-flowing glacier ice meets slow-moving ice or rock (in this case, ice attached to the Dufek Massif in Antarctica’s Pensacola Mountains). Credit: NASA / Maria-Jose Viñas