Is Granite Extrusive Or Intrusive Igneous Rock

Igneous rocks are classified into two groups depending upon where the molten rock solidifies.

Is granite extrusive or intrusive igneous rock.

Intrusive rocks are very hard in nature and are often coarse grained. Extrusive rocks are formed on the surface of the earth from lava which is magma that has emerged from underground. Igneous rocks form from magma that erupted onto the surface as lava where it cooled quickly. On the other hand intrusive igneous rocks form from magma that cooled slowly deep.

The two main categories of igneous rocks are extrusive and intrusive. Intrusive igneous rocks crystallize below earth s surface and the slow cooling that occurs there allows large crystals to form. Extrusive igneous rocks cool and solidify more quickly than intrusive igneous rocks. See sierra nevada batholith.

The other is extrusive rock that is a volcanic eruption or similar event. Some cool so. 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. The magma on the surface lava cools faster on the surface to form.

Key terms felsic. Many mountain ranges such as the sierra nevada in california are formed mostly from large granite or related rock intrusions. Intrusive rocks are formed. Derived from the words feldspar and silica to describe an igneous rock having abundant light colored minerals such as quartz feldspars or muscovite.

For example two rocks from identical magma can become either rhyolite or granite depending on whether they cool quickly or slowly. Examples of intrusive igneous rocks are diabase diorite gabbro granite pegmatite and peridotite. Intrusions are one of the two ways igneous rock can form. Intrusive rock forms within earth s crust from the crystallization of magma.

Extrusive igneous rocks erupt onto the surface where they cool quickly to form small crystals. Extrusive igneous rocks are formed when molten magma spill over to the surface as a result of a volcanic eruption. They are formed by the cooling of molten magma on the earth s surface.