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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.)

Sources Checked for Data in Record

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

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