<p>How Gas Carves Channels – 
The ground likely started as polygonal patterned ground, and then escaping gas widened the channels.
</p>
NASA/JPL/University of Arizona (less than 1 km across; <a rel="nofollow" class="external text" href="http://www.uahirise.org/ESP_046845_0975">www.uahirise.org/ESP_046845_0975</a>)
<a rel="nofollow" class="external text" href="https://www.flickr.com/people/71688597@N05">UAHiRISE (NASA)</a>
2017-01-25 15:27
<a rel="nofollow" class="external text" href="https://www.flickr.com/photos/uahirise-mars/32147084760/">ESP_046845_0975</a>