We normally determine the relative ages of planetary surfaces by counting craters.This technique works for some of Jupiter's Galilean moons but not for others.Where can we use it?
A) all except Io
B) Ganymede and Callisto
C) only Ganymede
D) only Callisto

Question

Quizplus · Accepted Answer

The crater counting technique works best for Ganymede and Callisto, as their surfaces have been heavily bombarded and have many visible craters. It does not work for Io, as its surface is constantly changing due to volcanic activity, and it is not a reliable method for Europa due to its icy surface that can cover up old craters.

We Normally Determine the Relative Ages of Planetary Surfaces by Counting