Extrusive igneous rocks form above the surface. The lava cools quickly as it pours out onto the surface (figure below). Extrusive igneous rocks are also termed volcanic rocks—named for vulcan, the roman god of fire. Web extrusive rocks are formed on the surface of the earth from lava, which is magma that has emerged from underground. Web extrusive rock, any rock derived from magma (molten silicate material) that was poured out or ejected at earth’s surface. Web intrusive rocks have a coarse grained texture. Extrusive igneous rocks cool much more rapidly. Extrusive, or volcanic, igneous rock is produced when magma exits and cools above (or very near) the earth's surface. Web extrusive igneous rocks. Web extrusive igneous rocks are erupted onto the surface or into the atmosphere.
Web extrusive rock, any rock derived from magma (molten silicate material) that was poured out or ejected at earth’s surface. Web extrusive rock, any rock derived from magma (molten silicate material) that was poured out or ejected at earth’s surface. The lava cools quickly as it pours out onto the surface (figure below). Extrusive igneous rocks are also termed volcanic rocks—named for vulcan, the roman god of fire. Web intrusive rocks have a coarse grained texture. Extrusive igneous rocks cool much more rapidly. Extrusive, or volcanic, igneous rock is produced when magma exits and cools above (or very near) the earth's surface. Web extrusive igneous rocks. Extrusive igneous rocks form above the surface. Intrusive rocks are formed from magma that cools and solidifies within the crust of the. By contrast, intrusive rocks are formed from magma that was forced into older rocks at depth within.
