Some Surface Features of Mars May Have Been
Formed by Ice, Not Water
January 17, 2001  Using sonar imaging technology, Dr. Baerbel Lucchitta of the US Geological Survey in Flagstaff, Arizona, reports that features on the Antarctic sea floor appear similar to those on Mars. BBC Article.

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Anarctica (left) and Mars (right)
BBC caption: Antarctic ice flow (left) is similar to Martian Ares Vallis