lava,
because it forms outside of Earth's surface and makes rocks that harden
Extrusive (Volcanic) igneous rock.
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.
Yes. Volcanic rocks are extrusive igneous rocks.
Extrusive igneous rocks i think are used for carving and awesome things like that!
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.