An igneous rock that has been poured out or ejected at or near the earth's surface.
extrusive igneous rock solidified near or on the surface of the Earth
Igneous rock that cools and solidifies at or very near the Earth's surface. Volcanoes produce volcanic rock.
Igneous rock that solidified on surface following a volcanic eruption; extrusive rock or lava; generally cools quickly, therefore is fine grained.
See extrusive rock.
Igneous rocks derived from magma or magmatic materials that are poured out or ejected (extruded) at or very near the Earth's surface.
a crystalline or glassy igneous rock formed by volcanic action near the earth's surface. [AHDOS
Volcanic rock is an igneous rock of volcanic origin.