Word: mountainless
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...surface of Callisto, the outermost of these moons, is riddled with craters, apparently the result of pummeling by meteorites for some 4 billion years. Although it is mountainless, Callisto has a feature never before seen in the solar system: a huge, smooth, circular basin rimmed with concentric ridges that look almost like a frozen tsunami (tidal wave). Appearances may not be entirely deceiving: the scientists speculated that these ridges were created when a particularly large meteorite hit, melted subsurface ice and caused the water to spread out from the place of impact, only to freeze rapidly again...
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