Ganymede has many features that look like its history may be similar to the Earth's Moon's, but with water on Ganymede playing the role of rock on the Moon.

Question

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Ganymede has many impact craters and grooves that are similar to those on the Moon, and these features suggest a violent geological history. However, unlike the Moon, Ganymede has a subsurface ocean and evidence of past tectonic activity driven by the interaction between its icy crust and internal ocean. In this sense, the water on Ganymede plays a role similar to the rock on the Moon in shaping its geological evolution.

Ganymede Has Many Features That Look Like Its History May