<p>Ice wedges form underground over time and produce polygons on the tundra. The complex patterns are best seen from the air. 
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Aerial view of polygons on the landscape.
<a rel="nofollow" class="external text" href="https://www.flickr.com/people/41585865@N06">Western Arctic National Parklands</a>
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<a rel="nofollow" class="external text" href="https://www.flickr.com/photos/nps_wear/8434155572/">Permafrost Polygons</a>