1. Compare and contrast the surface features of the four Galilean satellites, discussing their geologic activity and their evolution. 2. To test your knowledge of the Galilean moons, do Interactive...

1. Compare and contrast the surface features of the four Galilean satellites, discussing their geologic activity and their evolution.

2. To test your knowledge of the Galilean moons, do Interactive Exercise 8-3 on the Web. You can print out your results, if required.

3. What energy source powers Io’s volcanoes?