Richardson Crater Dunes, Partially Defrosted

Large patches of carbon dioxide frost are observed, linked in some places by channels possibly carved into the ground by the erosion of carbon dioxide gas, as blocks dry ice slide down slope and sublimate (evaporate directly from solid to gas). Numerous dust devil tracks have left their mark.

https://uahirise.org/hipod/PSP_004230_1080
NASA/JPL-Caltech/University of Arizona
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