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A '''volcanic eruption''' is a forceful explosion of volcanic material such as [[steam]], [[environmentally harmful gas]]es, [[lava]] and rocks into the air. This often severely damages the [[environment]] [[local]] to the [[volcano]] and can cause loss of [[human]] life in [[local]] [[settlement]]s. '''Volcanic eruptions''' are often caused by movement in the earth's [[tectonic plateplateS]]s that allows [[magma]] to rise to the surface of the earths's [[crust]].