New high resolution pictures of Mars are providing evidence that ice on Mars has a preference to certain latitudes, which in turn suggests that Mars has a latitude-dependent climate. Certain land features and debris on Mars give evidence for glaciers and there are similarities to the Arctic and Antarctic regions on Earth. James Head III described the process as "a quest to understand the Martian water cycle."
http://www.sciencedaily.com/releases/2007/10/071026095131.htm
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