<p>Wide, Branching Channels – Southern spring on Mars brings sublimation of the seasonal dry ice polar cap. Gas trapped under the seasonal ice sheet carves channels on its way to escaping to the atmosphere. 
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NASA/JPL/University of Arizona (less than 1 km across, 250 km above the surface; <a rel="nofollow" class="external text" href="http://www.uahirise.org/ESP_047718_0995">www.uahirise.org/ESP_047718_0995</a>)
<a rel="nofollow" class="external text" href="https://www.flickr.com/people/71688597@N05">UAHiRISE (NASA)</a>
2017-01-11 10:58
<a rel="nofollow" class="external text" href="https://www.flickr.com/photos/uahirise-mars/32213761546/">ESP_047718_0995</a>