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Ganymede, Callisto and Titan are each about half frozen water. The other half is:
ARock and metal
BHydrogen gas
CFrozen methane
DLiquid nitrogen
Answer & Solution
Correct answer: A. Rock and metal
1. They are the three largest moons.
2. The balance is solid, not gas.
3. It is rock and metal.
_Source: OpenStax Astronomy 2e, Chapter 7, Other Worlds: an Introduction to the Solar System._
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