A ROLLING SURFACE marks Nili Patera, the summit region of Syrtis Major, a large, but low-rise volcano. Inside Nili, scientists have found both ordinary basalt lavas and flows of dacite, a different kind of lava that indicates that molten rock has evolved chemically within the volcano. This view looks southeast. (A 370 kB version of the image is available.) Credit: NASA/JPL/Arizona State University, R. Luk (vertical exaggeration about 2x).
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