The three outer Galilean satellites of Jupiter-Europa, Ganymede, and Callisto-all appear to have cores of rock. In addition to rocky material, the major constituent of these satellites seems to be ices of
A) water.
B) carbon dioxide.
C) ammonia.
D) methane.

Question

Quizplus · Accepted Answer

The major constituent of the outer Galilean satellites, in addition to rocky material, is water ice. This is supported by observations and models of their compositions and structures.

The Three Outer Galilean Satellites of Jupiter-Europa, Ganymede, and Callisto-All