What is the fundamental driver behind Io's status as the most volcanically active world in the solar system?

Answer

The massive tidal forces exerted by Jupiter and its other large moons

Io's extreme volcanism is driven by the immense tidal forces exerted upon it by Jupiter and the other large Galilean moons.

What is the fundamental driver behind Io's status as the most volcanically active world in the solar system?
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