This Bizarre Terrain on Mars is Caused by Water Ice and Carbon Dioxide Image by HiRISE , article by Nancy_A
Spring fans and polygons on Mars, as seen by the HiRISE camera on the Mars Reconnaissance Orbiter. Credit: NASA/JPL-Caltech/UArizona.
“The particles drop to the surface in dark fan-shaped deposits. Sometimes the dark particles sink into the dry ice, leaving bright marks where the fans were originally deposited. Often the vent closes, then opens again, so we see two or more fans originating from the same spot but oriented in different directions as the wind changes.”
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