Classifying Rocks Essay -- Geology Geological Rock Essays Papers

Classifying RocksRocks are class to make it easier on people to line them in the future. This can be done by a legion(predicate) amount of ways. Each rock type has their own specific ways, besides there are two distinct characteristics that apply to all. These are cereal and composition. These two, along with many others helps to pass on perfervid, sedimentary, and metamorphic rocks.Igneous rocks are classified first by texture. This is broken down mainly into grain size. foremost there are intrusive, or plutonic igneous rocks. These types of rocks cool off inside the crust and forms large, visible crystals. The opposite would be extrusive, or volcanic rocks. These cool at the surface rapidly, forming small grains. A combination of the two would be porphyritic, large grains in an aphanitic, or extrusive matrix. Secondly, composition is used to classify igneous rocks. There are four types, ultramafic, mafic, intermediate, and felsic. Ultramafic rocks are very Acherontic and contain and extreme amount of iron and atomic number 12. Mafic rocks are also inglorious in color they too contain high iron and magnesium amounts. An example would be olivine, or pyroxene. Intermediate igneous rocks are make from silica and plagioclase. They tend to be grays and browns in color. Finally, felsic socks are light in color and contains high amounts of silica. Quartz and potassium feldspar are examples of felsic igneous rocks. Other types of rocks are classified similarly.Sedimentary rocks form...