any rock derived from magma (q.v.; molten silicate material) that is poured out or ejected at the Earth`s surface. By contrast, intrusive rocks are ... [5 related articles]
Found on
http://www.britannica.com/eb/a-z/e/62
volcanic rock which solidifies on the surface of the earth rather than inside of the earth
Found on
https://sciencetrek.org/sciencetrek/topics/geology/glossary.cfm
Click images to enlargeIgneous rock formed on the surface of the Earth by volcanic activity (as opposed to intrusive, or plutonic, rocks that solidify below the Earth's surface). Magma (molten rock) erupted from volcanoes cools and solidifies quickly on the surface. The crystals that form do not have time to grow very...
Found on
https://www.encyclo.co.uk/local/21221
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