position, volcanism, aeolian deposition, and crystal growth.
             The discovery of drainage channels consistent with formation by water by the Mariner 9 mission has shown evidence that liquid water once flowed on Mars. Fluvial deposition is responsible for many of the symmetrical formations on Mars such as the numerous teardrop shaped islands in ancient streambeds, but can not account for the symmetry of the D&M pyramid. Quite recently, the Mars Global Surveyor and Mars Odyssey mission found evidence to support the existence of an ancient cean in Mars? northern hemisphere where Cydonia is located, and found that the City, Face, and D&M Pyramid are located near the 0 km datum; sea level (Head et. Al. 1999). Therefore, this indicates that there was no water flowage around the pyramid, much less the 1 km depth (the approximate height o
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