How Is Extrusive Rock Formed - As also mentioned above, extrusive rocks. Web extrusive rock differs from intrusive rock in the way that it forms. Extrusive or volcanic igneous rocks form after lava cools above the surface. Web intrusive rocks have a coarse grained texture. Web extrusive igneous rocks erupt onto the surface, where they cool quickly to form small crystals. Extrusive, or volcanic, igneous rock is produced. Some cool so quickly that.
Web intrusive rocks have a coarse grained texture. Some cool so quickly that. Web extrusive igneous rocks erupt onto the surface, where they cool quickly to form small crystals. Extrusive, or volcanic, igneous rock is produced. Web extrusive rock differs from intrusive rock in the way that it forms. As also mentioned above, extrusive rocks. Extrusive or volcanic igneous rocks form after lava cools above the surface.