Rocks that form directly from magma.They are classified as basaltic or granite, and as intrusive or extrusive.
Sedimentary-
Form from sediments such as mud, sands, or gravels compressed by overlying sediments. This formation takes a long time to occur so most of these rocks are usually fossils.
Metamorphic-
The combination of the two when they are put in high pressure and high temperature.
Soils-
Texture diagram:
12 Soil Orders:
http://www.cals.uidaho.edu/soilorders/orders.htm
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