A volcano is a opening in the surface of the earth which allows hot, molten rock, ash, and gases to escape from below the surface through a pipe-like outlet called a vent. These eruptions form a cone-shaped landform made of these materials.
- Magma chamber: A large underground pool of molten rock found beneath the surface of the Earth.
- Lava: Hot molten magma when it reaches the surface.
- Vent: An opening which allows hot magma, ash and gases to escape.
- Crater: A bowl-shaped opening at the top of a volcano
- Ash cloud: Clouds of steam, gases and hot ash that is spewed out from a volcanic eruption.
- Volcanic bombs: A mass of molten rock that are ejected during a volcanic eruption.
Videos on the structure of a volcano
National Geographic – How Volcanoes Form
Formation of volcanic islands