Ganymede is composed of silicate? rock and water ice, with an ice crust floating over a slushy mantle that may contain a layer of liquid water. Ganymede's crust appears to be divided into separate plates which, like Earth's [tectonic plate]?s, are able to move independantly and interact along fracture zones producing mountain ranges. The largest feature on Ganymede is a dark plain named Galileo Regio, as well as a series of concentric ridges that are remnants of an ancient impact crater long since obscured by subsequent geological activity.
Data for Ganymede:
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