Igneous rock is rock formed from magma that solidifies.
Based pembekuannya place, igneous rocks can be divided into two, namely igneous
rocks and igneous rocks in the outside.
a. Igneous rocks in
Igneous rock formed from magma in the form beneath the
earth's surface. Therefore, freezing occurs magma below the earth's surface,
the rock is called intrusive igneous rock. Examples of igneous rocks in, among
others granite, gabbro, and diorite.
b. Igneous rocks outside
Outside is igneous rock formed from freezing frozen magma
that reaches Earth's surface. Because pembentukanya on the surface, it is
called extrusive igneous rocks. Some examples of igneous rocks outside,
including basalt, andesite, obsidian, and purnice (pumice).
Based on the chemical content (content of SiO2), igneous
rocks can be divided into four, namely igneous rocks of acid, alkaline igneous
rocks, and ultramafic igneous rocks.
a. Acid igneous rocks, SiO2 content results,> 65%.
Examples of these rocks, among others, granite and ryolit.
b. Intermediate igneous rocks, SiO2 content, between 52%
-65%. Examples of this type of assistance is diorite and andesite.
c. Alkaline igneous rocks, SiO2 content of between 42% -52%.
Examples of these rocks are gabbro and basalt.
d. Ultramafic igneous rocks, SiO2 content results in
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