They are rocks that formed from cooled lava on the earth's surface.
Rhyolititcen rocks.
Some do. These are called extrusive igneous rocks. However a large portion of igneous rocks form beneath the surface. These are intrusive igneous rocks.
extrusive igneous rocks =/
Extrusive igneous rocks are usually fine grained.
Extrusive igneous rocks i think are used for carving and awesome things like that!
Yes. Volcanic rocks are extrusive igneous rocks.
Extrusive igneous rocks are igneous rocks that form above earth's surface. They are usually fine-grained due to the rate in which they cool.
There are so many rocks that can be classified as not a common extrusive igneous rock. The most common extrusive igneous rock is basalt. Extrusive rocks are formed as a result of lava solidifying.
Extrusive igneous rocks.
"intrusive" means forced into something, "extrusive" means forced out onto the surface. The igneous magma reaching the surface is therefore extrusive , producing extrusive igneous rocks, and all the rest of the magma is intrusive, producing intrusive igneous rocks.
An extrusive igneous rock is when a volcano erupts and magma flows down, then cools, forming rocks.
Magma that is ejected during a volcanic eruption forms extrusive igneous rocks. They are also referred to as volcanic rocks.