EarthScience+Outlines.

=  I. Classifying Rocks =
 *  A. Mineral Composition and Color **

 1. Rocks are made of mixtures of minerals and other material.
===  2. __Granite __- is a rock made of a couple different minerals and materials. ===

 Granite usually has a high silica content.
===  3. __Basalt __ is a dark colored rock that has low silica content. ===

 B. Texture
===  1. __Grain size __- often you can see grain in a rock without a microscope, but sometimes you need one; ===

 easily to grain is coursed grain, hard to see: fine grain.
=== <span style="font-family: "Times New Roman","serif";"> 2. __<span style="font-family: "Times New Roman","serif";">Grain shape __<span style="font-family: "Times New Roman","serif";">- is usually different crystals can help determine what kind of grain it is, ===

<span style="font-family: "Times New Roman","serif";"> if it’s smooth or jagged grain.
=== <span style="font-family: "Times New Roman","serif";"> 3. __<span style="font-family: "Times New Roman","serif";">Grain patterns __<span style="font-family: "Times New Roman","serif";">- some form in layers like sheets, and others swirl randomly this is called gness ===

__<span style="font-family: "Times New Roman","serif";"> Igneous rock, Sedimentary rock, and metamorphic rock. __
==== <span style="font-family: "Times New Roman","serif"; font-style: normal;"> a) __<span style="font-family: "Times New Roman","serif"; font-style: normal;">Igneous rock __<span style="font-family: "Times New Roman","serif"; font-style: normal;">- formed from cooling of magma or lava. ==== ==== <span style="font-family: "Times New Roman","serif"; font-style: normal;"> b) __<span style="font-family: "Times New Roman","serif"; font-style: normal;">Sedimentary rock __<span style="font-family: "Times New Roman","serif";">- <span style="font-family: "Times New Roman","serif"; font-style: normal;"> forms when particles of other rocks or the remains of plants and  ====

<span style="font-family: "Times New Roman","serif"; font-style: normal;"> animals are pressed and cemented together, forms in layers below the surface.
==== <span style="font-family: "Times New Roman","serif"; font-style: normal;"> c) __<span style="font-family: "Times New Roman","serif"; font-style: normal;">Metamorphic rock __<span style="font-family: "Times New Roman","serif"; font-style: normal;">- forms when existing rock is changed by heat, ====