The LEAST geologically active of Jupiter's Galilean moons is:
A) Europa.
B) Callisto.
C) Ganymede.
D) Io.

Name: The LEAST geologically active of Jupiter's Galilean moons is: A) Europa. B) Callisto. C) Ganymede. D) Io.
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Callisto is considered the least geologically active of the Galilean moons. Unlike Io, which has active volcanoes, or Europa and Ganymede which show evidence of recent geological activity, Callisto's surface is mostly ancient and heavily cratered.

The LEAST Geologically Active of Jupiter's Galilean Moons Is