What is the primary driver of Io's extreme volcanic activity?

Answer

Fierce, external gravitational flexing (tidal flexing)

Io's geological turmoil is driven by the powerful, external gravitational forces exerted primarily by Jupiter, amplified by its slightly eccentric orbit, which causes constant stretching and squeezing internally.

What is the primary driver of Io's extreme volcanic activity?
GeologyJupitermoonsVolcanismTidal heatingIogeological activity