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Igneous Rock
Chapter 4 Section 2
![Page 2: Igneous Rock Chapter 4 Section 2. Igneous rocks Igneous rocks are classified by their origin, texture, and mineral composition](https://reader030.vdocuments.us/reader030/viewer/2022032313/56649e715503460f94b6ed48/html5/thumbnails/2.jpg)
Igneous rocks
Igneous rocks are classified by their origin, texture, and mineral composition
![Page 3: Igneous Rock Chapter 4 Section 2. Igneous rocks Igneous rocks are classified by their origin, texture, and mineral composition](https://reader030.vdocuments.us/reader030/viewer/2022032313/56649e715503460f94b6ed48/html5/thumbnails/3.jpg)
Origin and Texture
• Extrusive rock- rock that forms from lava on or near Earth’s surface
- they have small crystals and
fine-grained texture due to quick
cooling
Andesite
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Origin and Texture
- Some cool so fast that no crystals
form and rock has a glassy texture
Obsidian
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Origin and Texture
• Intrusive rock – rock that forms from magma beneath Earth’s surface
- they have large crystals and a coarse-
grained texture due to slow cooling
Granite
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Mineral Composition
• Minerals low in silica are dark colored and dense
• Minerals high in silica are usually light colored and less dense
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Uses of Igneous Rock
Statues
Fortresses
Bridges
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Uses of Igneous Rock
CountertopsGravel
StreetsCleaning, polishing, andcutting tools