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These two tholi are two of the strangest volcanoes on Io. Unlike most volcanoes on Io which erupt basaltic or ultramafic lavas, these volcanoes are believed to represent a class of volcano that erupts slica-rich lavas. Tholi on Io are charachterized by short, pancake-shaped mounds with a central caldera. Galileo in I33 would image Inachus Tholus at 9 m/pixel and both tholi at 80 m/pixel.
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