Volcanic

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Description

Igneous rock extrusive rock formed at the Earth's surface and having aphanitic structure. Volcanic rock is emitted by a volcano, which is an opening, or rupture, in a planet's surface or crust that allows hot magma, ash and gases to escape from below the surface.

Synonyms and Related Terms

vulcnica (Port.); volcanique (Fr.)

Authority

  • Submitted information, Submitted information Comment: Jos Delgado Rodrigues, LNEC, 2009.

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