Unformatted text preview: assumed composition of silicates (fraction of olivine and pyroxene ) and amount of sulfur in the core.   The most probable values are 700–900 km for the core radius and 800–1000 km for the thickness of the outer ice mantle, with the remainder being made by the silicate mantle.     The density of the core is 5.5–6 g/cm 3 and the silicate mantle is 3.4–3.6 g/cm 3 .     Some models of the magnetic field generation require the existence of a solid core made of pure iron inside the liquid Fe–FeS core—similar to the structure of the Earth's core. The radius of this core may be up to 500 km.  The temperature in the core of Ganymede is probably 1500– 1700 K and pressure up to 10 GPa...
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- Fall '10
- Astronomy, Fundamental physics concepts, Structure of the Earth, Mantle