HotSpots: Volcano PartsOnline version Identifying the different parts of a volcano by Benjamin D Morgan 1 Magma Chamber 2 Main Vent 3 Side Vent 4 Cone 5 Summit 6 Magma, toxic gases, and water vapor 7 Less dense rock 8 More dense rock 9 volcanic eruption 10 Lava 11 Magma 12 Ash 13 Crater 14 caldera 15 Lava Dome 16 Water vapor and toxic gases