This is a cutaway of Ganymede's interior.
Click on image for full size
NASA
Interior of Ganymede
The picture on this page shows what the inside of Ganymede looks like. Scientists have made this model based on measurements by the Galileo spacecraft. The picture shows a samll core of metal (silver), then some rocky material (brown), then some ice (blue).
Using Galileo, scientists also found that Ganymede has a strong magnetic field - the first time this was ever measured near any moon!
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