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Limb of Ganymede

The interior of Ganymede is thought to consist of a rocky core about the size of our Moon and to be surrounded by a thick covering of ice roughly equal in mass. Because the surface of Ganymede is made of ice, mountainous terrain would eventually collapse. Complex intersecting avenues of dark and bright terrains record multiple episodes in which the crust was fractured and reformed by icy volcanic fluids. About the size of Mercury, Ganymede is 5280 km (3168 mi) in diameter.

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