Here are a couple images sent back by a robotic spacecraft circling mars. Apparently these are of a series of avalanches that have occured at Mars' North Pole. The images pictured are of ice (hypothesized to be Carbon Dioxide frost) and dust breaking from the edge of a cliff. The ice kicked up massive dust clouds that measured 590 feet across.http://dsc.discovery.com/news/2008/03/04/mars-avalanche.html
http://www.time.com/time/health/article/0,8599,1719470,00.html
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