Radial Channels carved by CO2 - a.k.a.: The "Spiders" (EDM - Natural Colors; credits: Lunexit)

In this EDM we can see, now that all the seasonal frost is gone, the actual appearence of the "Spiders" and we can both use stereo images (when available) or shadows (if any) to measure the depth of the Channels carved into the ground (which, by the way, are usually 1 or 2 meters deep).