| http://www.w3.org/ns/prov#value | - In stark contrast to the other Galilean moons, Io??s surface is neither cratered nor streaked. (The circular features visible in Figures 11.17 and 11.18 are volcanoes.) Its surface is exceptionally smooth, mostly varying in altitude by less than about 1 km, although some volcanoes are several kilometers high.
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