Is Granite Extrusive Rock

For example two rocks from identical magma can become either rhyolite or granite depending on whether they cool quickly or slowly.

Is granite extrusive rock.

Granite is an intrusive rock while rhyolite is an extrusive rock intrusive rocks are rocks that are formed below the earth s surface extrusive rocks are rocks that are formed on the earth s. The way granite is formed and the elements it is composed of is what makes it an intrusive rock and not an extrusive one. Intrusive rocks are formed. Magma originates deep within the earth near active plate boundaries or hot spots.

Many mountain ranges such as the sierra nevada in california are formed mostly from large granite or related rock intrusions. Photo by eva didonato. See sierra nevada batholith. Basalt by zureks cc by sa 3 0.

Extrusive rocks are formed on the surface of the earth from lava which is magma that has emerged from underground. Komatiite is a very rare and old extrusive igneous rock. Intrusive igneous rocks crystallize below earth s surface and the slow cooling that occurs there allows large crystals to form. An extrusive igneous rocks definition states these rocks form when magma exits and cools above or very near the earth s surface examples of extrusive igneous rocks include basalt andesite rhyolite dacite obsidian pumice and scoria.

Intrusions are one of the two ways igneous rock can form. Intrusive rock forms within earth s crust from the crystallization of magma. Basalt is an extrusive igneous rock whereas granite is an intrusive ingenuous rock. Extrusive rock any rock derived from magma molten silicate material that was poured out or ejected at earth s surface.

Igneous rocks from the greek word for fire form when hot molten rock magma crystallizes and solidifies. Examples of intrusive igneous rocks are diabase diorite gabbro granite pegmatite and peridotite. The molten material then slowly solidifies below earth s surface where it may later be exposed through erosion. While basalt rocks split along columnar planes granite rocks give way along horizontal planes.

Magma that rises to the surface is called lava. The formation of different types of granite is one of the most interesting natural occurrences taking place underneath the surface. The other is extrusive rock that is a volcanic eruption or similar event. Extrusive igneous rocks erupt onto the surface where they cool quickly to form small crystals.

By contrast intrusive rocks are formed from magma that was forced into older rocks at depth within earth s crust. The two main categories of igneous rocks are extrusive and intrusive. Granite is the best example of intrusive rocks whereas the basalt is a fine example of extrusive rocks.