What Is The Difference Between Extrusive And Intrusive Igneous Rocks

Intrusive igneous rocks are formed when the magma cools and solidify below the surface of the earth.

Intrusive igneous rocks come from magma forming deep underground and taking longer to cool meaning they form larger crystals. The difference between an extrusive and intrusive igneous rock is the way in which they cool. Rocks made from lava tuff pyroclastic flows etc. Granodiorite is an intrusive igneous rock in composition intermidiate between diorite and granite.

Whereas intrusive rocks are formed from molten rock in situ underground often relatively deep e g. An extrusive igneous rock cools very fast on the surface and is created by lava. What is the difference between intrusive and extrusive rocks. Intrusive rocks are formed deep inside the surface of the earth whereas extrusive rocks are formed at the surface of the earth when magma finds a way to eject or pour out of the surface.

These rocks usually form from a volcano so they are also called volcanic rocks figure below. What is the difference between an intrusive. It typically contains more than 20 quartz by volume a large amount of sodium na and calcium ca rich plagioclase minor amounts of muscovite mica and biotite and amphiboles as the darker minerals. An intrusive igneous rock is formed from magma undergroundextrusive.

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An extrusive igneous rock is formed from lava outside of the volcano. Extrusive igneous rocks are formed by cooling the molten magma on the surface of the earth. Granite gabbro peridotite dolerite etc. Since the cooling process is very fast extrusive igneous rocks have very small crystals fine grained.

Intrusive rocks are formed from magma whereas extrusive rocks are formed from lava. Igneous rocks are called extrusive when they cool and solidify above the surface. Igneous rocks will consist of crystals due to the process of cooling down. The molten magma comes on to the earth s surface through cracks fissures and volcanic eruption.

The slower the cooling process the longer the crystals have time to form. Extrusive igneous rocks form after lava cools above the surface. Extrusive igneous rocks come from lava forming at the surface of the earth and cooling quickly meaning they form very small crystals.