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Computer artwork of Io cut away to show interior
Interior of Io. Computer artwork of the interior of Io, a moon of the planet Jupiter. At its core (silver) is metal, with a turbulent rocky mantle (orange) above it. Io's crust is covered in sulphur compounds from volcanic activity, and volcanoes erupt almost continually on its surface. Io is the nearest of the moons to Jupiter, and the energy for these eruptions comes in part from the tidal forces the massive planet's gravity induces. Io is thought to be the most geologically active body in the Solar System.
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