+
3 Tutorials that teach Geology: Igneous Rocks
Take your pick:
Geology: Igneous Rocks

Geology: Igneous Rocks

Author: Nathan Lampson
Description:
This lesson will present how to identify and classify igneous rocks.
(more)
See More
Try a College Course Free

Sophia’s self-paced online courses are a great way to save time and money as you earn credits eligible for transfer to over 2,000 colleges and universities.*

Begin Free Trial
No credit card required

25 Sophia partners guarantee credit transfer.

221 Institutions have accepted or given pre-approval for credit transfer.

* The American Council on Education's College Credit Recommendation Service (ACE Credit®) has evaluated and recommended college credit for 20 of Sophia’s online courses. More than 2,000 colleges and universities consider ACE CREDIT recommendations in determining the applicability to their course and degree programs.

Tutorial

 

Igneous rocks are rocks that form from magma or lava.  

 

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

 

Origin

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.