What is the source of energy that powers Io’s volcanoes? What evidence is there for an ocean of liquid water beneath the icy surface of Europa?

1) What is the source of energy that powers Io’s volcanoes?
2) What evidence is there for an ocean of liquid water beneath the icy surface of Europa?
3) What are some differences between regular and irregular moons? (name at least 3)
4) What are the characteristics of the atmosphere of Titan? (name at least 3)
5) If you were to send a spacecraft to search for life on one moon of Jupiter or Saturn, which moon would you send it to and why? (There are multiple correct moons to choose from, I care more about your reason for choosing it.)

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