Volcanic

Description

Igneous 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

vulcânica (Port.); volcanique (Fr.)

Resources and Citations

• José Delgado Rodrigues, LNEC, Submitted information, 2009.