Io
- Most volcanically active body in the Solar System
- Discovered during the Voyager mission
- Shield volcanoes
- Sulfuric compounds
- Consists of hot silicate lava like the volcanoes on Earth
- Eruptive plumes are created when hot lava encounters frozen deposits of sulfur and sulfur dioxide
- The plumes cool and then fall back to the surface in "snowfalls"
- Craterless because of the amount of volcanic activity
- Tidal heating
- Low gravity
- Thin atmosphere