| Abstract from DBPedia | Volcanism, vulcanism or volcanicity is the phenomenon of eruption of molten rock (magma) onto the surface of the Earth or a solid-surface planet or moon, where lava, pyroclastics, and volcanic gases erupt through a break in the surface called a vent. It includes all phenomena resulting from and causing magma within the crust or mantle of the body, to rise through the crust and form volcanic rocks on the surface. Magmas, that reach the surface and solidify, form extrusive landforms.火山作用（かざんさよう、英語: volcanism, volcanic activity）は、火成作用（かせいさよう、英語: igneous activity）のうちマグマが地表面・海底面・地殻表層部で引き起こす現象の総称である。 火山活動、火山現象ともよばれる。マグマや火山ガスの上昇、噴火・噴気、火山噴出物の放出・堆積、溶岩の噴出・堆積、火山体や火山島の形成、火成岩の生成、火山性地震などが含まれる。 (Source: http://dbpedia.org/resource/Volcanism) |
