What causes Io to be so active geologically?
A) Its mantle has an unusually high density of long-term radioactive elements.
B) It is still contracting gravitationally and gives out energy via the Kelvin-Helmholtz mechanism.
C) It is in a highly eccentric orbit and thus is subjected to tidal flexing from Jupiter.
D) It is in a very circular orbit, but it is subjected to tidal flexing from Jupiter because of orbital perturbations from the other Galilean satellites.

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The Answer of What causes Io to be so active geologically?
A) Its mantle has an unusually high density of long-term radioactive elements.
B) It is still contracting gravitationally and gives out energy via the Kelvin-Helmholtz mechanism.
C) It is in a highly eccentric orbit and thus is subjected to tidal flexing from Jupiter.
D) It is in a very circular orbit, but it is subjected to tidal flexing from Jupiter because of orbital perturbations from the other Galilean satellites.

What Causes Io to Be So Active Geologically