The outer three Galilean moons of Jupiter differ from Io, the innermost Galilean moon, because they have surfaces of
A) smoothly polished rock.
B) carbon dioxide ice.
C) sulfur.
D) water ice.

Question

Quizplus · Accepted Answer

The outer three Galilean moons of Jupiter (Europa, Ganymede, and Callisto) have surfaces primarily composed of water ice, distinguishing them from Io, which is characterized by volcanic activity and a surface covered in sulfur and sulfur dioxide.

The Outer Three Galilean Moons of Jupiter Differ from Io