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Using data from Mars Odyssey scientists have determined that a mountain chain on Mars was likely created as a chain of volcanoes.
They analyzed the geography and mineralogy of this area they termed Greater Thaumasia, which is about the size of North America. They also studied the chemistry of this area based on Gamma Ray Spectrometer data collected by the Mars Odyssey Orbiter, which was launched in 2001. What they found was the mountain ridge that outlines Greater Thaumasia was most likely created by a chain of volcanoes.
Their research also looked to see if water influenced the mountains’ formation and found no evidence for it. The mountain chain itself is south of the giant Valles Marineris canyons and southeast of the Tharsis region where Mars’ biggest four volcanoes are located.