Ice-covered dunes crack in warmer springtime temperatures and allow sand beneath to blow into fan-shaped deposits on top of the ice. When the ice cracks at the crest of a dune, the sand sometimes slides down, leaving dark traces in the dune walls.
January 26, 2013 9:00 AM PST
Photo by: NASA/JPL-Caltech/Univ. of Arizona
| Caption by: James Martin
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