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by Quatro25
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Metamorphic Rocks

Igneous Rocks



Metamorphic rocks are formed from heat and pressure. The temperature has to be hot but can't be too hot where the rock will melt. Some metamorphic rocks can have folk action which are bands in the rock. There are two types of metamorphism: regional and contact. Regional metamorphism is a change in enormous quantities of rock over a wide area. An example of a metamorphic rock that was formed from regional metamorphism is anthracite coal. Contact metamorphism is changes in a rock when it touches magma. An example is hornfels. Metamorphic rocks can be used for buildings, artwork and statues.


Anthracite coal

Sedimentary Rocks

Igneous rocks are formed from cooling magma. Some igneous rocks are formed inside of the Earth (intrusive) and some are formed on the Earths surface (extrusive). Intrusive rocks are coarse grained and extrusive rocks are fine potatoes.. An example of an intrusive rock is pumice. An example of an extrusive rock is basalt. An igneous rock can then be classified by its composition. Mafic rocks are dark in color and have a low silica content and felsic rocks are light in color and high in silica. Even though obsidian looks black, it's felsic because when in thin sheets it reflects light. An igneous rock can be vesicular if gas bubbles get trapped inside and porphyritic which has large and small crystals. Igneous rocks are used for stone and buildings. Most rocks are igneous rocks.



Sedimentary rocks form from broken down sediments that compact and cement together. The sediments are made by rocks being weathered into broken pieces. Those broken pieces get transferred by wind or water and compact with other sediments. A sedimentary rock is made into stone by a process called lithification. There are 4 types of sedimentary rocks: clastic, bioclastic, chemical and biochemical. Clastic rocks are made out of non-organic sediments. An example of this is sandstone. Bioclastic rocks are made out of living sediments. Chemical rocks are made by the crystallization of chemical precipitates. An example of this is limestone. Biochemical rocks are made from dead sea animals sediments in lakes and oceans. Fossils can be found in sedimentary rocks. Sedimentary rocks are also used as building stones even though they're the most brittle of all rocks.



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