Io's energy source is external---Jupiter's gravity. Io orbits very close to Jupiter, the planet's huge gravitational field produces strong tidal forces on the moon, resulting in a large tidal bulge. If Io were Jupiter's only satellite, it would have long ago have come into a state of synchronous rotation with the planet. In that case, Io would move in a perfectly circular orbit with one face permanently turned toward Jupiter. The tidal bulge would be stationary, and there would be no internal stresses and no volcanism. However, Io experiences tidal pull from Jupiter's other moons also.
Volcanoes.
Io
Io is a satellite of Jupiter.
Yes. IO has over 400 active volcanoes and it is one of the most geologically active objects in the Solar System. Voyager 1 photographed a volcano erupting on IO.
Jupiter's moon Io has over 400 active volcanoes.
Yes. Io is the most volcanically active object in the solar system.
Io, the moon of Jupiter.
answer: composite volcano's
It is covered in volcanoes. Currently, it is the only known moon in our solar system to have active volcanoes.
Horse Isle: Io~TwilightPrincess, Brown and Roan.
Jupiter's moon, Io, is the only moon known to currently have volcanoes.
The surface of Io is covered in primarily sulphur, with areas of sulphur dioxide frost.