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" ... The commonly accepted view is that Tharsis lies over a hot spot or superplume similar to the situation with the Hawaiian Islands, Jim Rice, senior scientist at the Planetary Science Institute in Tucson, Ariz., told me. However, since Mars has no moveable crustal plates (in contrast to Earth), the Tharsis region’s crust didn’t move but stayed stationary over the hot spot. This enabled these volcanoes to grow to such enormous size, Rice says. ... "