This image shows the grooved terrain of Ganymede.
Click on image for full size
Grooves of Ganymede
Instead of icy-volcanism, the surface of Ganymede reveals a gradual surface stretching which is similar to the crustal stretching of the Earth. In this case, the folding and stretching of the crust of Ganymede resulted in big blocks of the crust being pulled apart, as shown in this image. When blocks of crust of crust are pulled apart it is called "rifting".
The lack of icy-volcanism, such as that found on Europa, probably stems from a lack of the kind of heating undergone by Europa. The existence of surface stretching suggests that there has been some heating of Ganymede, nonetheless.
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