Is Granite Extrusive Or Intrusive Igneous Rock

Extrusive rocks are formed on the surface of the earth from lava which is magma that has emerged from underground.

Is granite extrusive or intrusive igneous rock.

Intrusions are one of the two ways igneous rock can form. Intrusive or plutonic igneous rocks form when magma cools slowly below the earth s surface most intrusive rocks have large well formed crystals. Examples include granite gabbro diorite and dunite. Derived from the words feldspar and silica to describe an igneous rock having abundant light colored minerals such as quartz feldspars or muscovite.

Intrusive rocks are very hard in nature and are often coarse grained. Intrusive rocks are formed. Some cool so. Extrusive igneous rocks cool and solidify more quickly than intrusive igneous rocks.

Igneous rocks form from magma that erupted onto the surface as lava where it cooled quickly. Intrusive igneous rocks crystallize below earth s surface and the slow cooling that occurs there allows large crystals to form. Many mountain ranges such as the sierra nevada in california are formed mostly from large granite or related rock intrusions. The two main categories of igneous rocks are extrusive and intrusive.

They are formed by the cooling of molten magma on the earth s surface. Examples of intrusive igneous rocks are diabase diorite gabbro granite pegmatite and peridotite. Gabbro and granite are examples of intrusive igneous rocks. Extrusive igneous rocks erupt onto the surface where they cool quickly to form small crystals.

Key terms felsic. The magma on the surface lava cools faster on the surface to form. Intrusive rock forms within earth s crust from the crystallization of magma. For example two rocks from identical magma can become either rhyolite or granite depending on whether they cool quickly or slowly.

The other is extrusive rock that is a volcanic eruption or similar event. Extrusive igneous rocks are formed when molten magma spill over to the surface as a result of a volcanic eruption. Extrusive igneous rocks also known as volcanic rocks are formed at the crust s surface as a result of the partial melting of rocks within the mantle and crust.