Active geysers have been observed in the south polar region of Mars: Martian Geysers. http://en.m.wikipedia.org/wiki/Martian_geyser A new program asks the public to help identify them: Scientists need you to analyze unseen images of Mars. By James Holloway January 15, 2013 http://www.gizmag.com/planet-four-analyze-mars/25801/ http://planetfour.org/#/about BTW, the current theory is they are formed by CO2 sublimation. I raised the possibility that subsurface liquid water is involved in their formation: North polar geysers? http://cosmoquest.org/forum/showthread.php/62470-North-polar-geysers?p=1040432#post1040432 Bob Clark