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Sedimentary rocks form from previously existing rocks or fragments of once-living organisms. They occur as a result of deposits accumulating on the Earth's surface. Layering or bedding in sedimentary rocks is common.
breccia
conglomerate
sandstone
siltstone
shale
Sedimentary rocks are formed from pieces of other existing rock or organic material. There are three different types of sedimentary rocks: clastic, organic (biological), and chemical.
Metamorphic rocks were previously igneous or sedimentary rocks that were altered (metamorphosed) by intense heat and/or pressure within the Earth's crust. They have a crystalline structure and are frequently "squashed" (foliated or banded). The original rock is heated (to temperatures of 150 to 200 °C) and pressed (1500 bars).
The three types of metamorphism are Contact, Regional, and Dynamic metamorphism. Contact Metamorphism occurs when magma comes in contact with an already existing body of rock.
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