3 Tutorials that teach Geology: Igneous Rocks
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Geology: Igneous Rocks

Geology: Igneous Rocks

Author: Nathan Lampson
This lesson will present how to identify and classify igneous rocks.
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Igneous rocks are rocks that form from magma or lava.  


Igneous rocks are classified according to their texture, origin, and mineral composition. 



Intrusive rock is a type of rock formed beneath the earth's surface.

Extrusive rock is a type of rock formed from lava on the earth's surface.


Texture and Mineral Composition

Rapidly cooling lava forms fine-grained igneous rocks with small crystals.  

Igneous rocks formed beneath the earth's surface have a coarse mineral texture.