A volcano that is not expected to erupt again. Long narrow crack or vent along which an eruption takes place. These lava moulds formed as lava flowed through the former forest, and solidified around the trees. The burnt trees disintegrated over time, leaving only hollow lava moulds as evidence of their presence. An area in the middle of the lithospheric plate where magma rises from the mantle and erupts at the Earth's surface.
Volcanoes sometimes occur above a hot spot.
Fluid rock, erupted from a volcano or fissure on the Earth's surface that flows away from the source. The term used for magma once it has erupted onto the Earth's surface. Molten rock containing liquids, crystals, and dissolved gases that forms within the upper part of the Earth's mantle and crust. When erupted onto the Earth's surface, it is called lava. A zone in the Earth's interior between the crust and the core that is 2900 kilometres thick.