articles

The two basic types of volcanic eruptions are effusive and explosive eruptions. In effusive eruptions, magma flows to the surface and down the sides of the volcano as lava. In explosive eruptions, magma violently rips th... More »

www.reference.com Science Earth Science Volcanoes

Various factors trigger a volcanic eruption. The three predominant factors are the magma's buoyancy, the pressure from the gases that separate in the magma and the merger of a new batch of magma with a chamber already fi... More »

www.reference.com Science Earth Science Volcanoes

A volcanic eruption is the expulsion of magma and gas from the Earth's interior. Most current volcanic eruptions are the result of one of three eruption mechanisms. More »

www.reference.com Science Earth Science Volcanoes
similar articles

Volcanic eruptions occur when magma builds up beneath the Earth's crust and forces its way to the surface. Natural vents in the crust allow magma passage to the surface, and eruptions occur when the magma that forms is l... More »

www.reference.com Science Earth Science Volcanoes

Volcanic eruptions mainly produce steam (H2 0 ), sulfur dioxide (SO 2 ) and carbon dioxide (CO 2 ). They do release other gases in lesser amounts, such as carbon monoxide (CO), helium (He), hydrogen (H 2 ), hydrogen chlo... More »

www.reference.com Science Earth Science Volcanoes

The most violent type of volcanic eruption is a Plinian eruption. This type can produce plumes of ash that are more than 30 miles high. More »

www.reference.com Science Earth Science Volcanoes

The most common and serious types of volcanic hazards are flowing lava, falling ash, glowing avalanches and moving mud and debris. The exact hazard level varies depending on the type of volcano erupting. Additional hazar... More »

www.reference.com Science Earth Science Volcanoes