What phenomenon is Io's extreme volcanism directly attributed to as a consequence of its orbital configuration?

Answer

Tidal heating caused by the resonance with Europa and Ganymede

The stable Laplace resonance causes Europa and Ganymede to gravitationally tug on Io with precise timing, flexing its interior and generating massive tidal heating.

What phenomenon is Io's extreme volcanism directly attributed to as a consequence of its orbital configuration?
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