The structure of Callisto, the outer Galilean satellite of Jupiter, is thought to be
A) a mixed ice-rock interior surrounded by a liquid ocean and then a solid icy crust.
B) mostly or entirely rock, with no firm evidence of an iron core, and active volcanoes on its surface.
C) an iron core surrounded by a rocky mantle and an ice mantle and crust.
D) almost all water ice, in view of its low average density.

Question

Quizplus · Accepted Answer

Callisto is believed to have a mixed ice-rock interior, which is surrounded by a possible subsurface liquid ocean, and then a solid icy crust. This structure is supported by its low density and magnetic field measurements.

The Structure of Callisto, the Outer Galilean Satellite of Jupiter