ENVS 1050 Chapter 8: Geology Notes - week 8
12 Feb 2016
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Steps: weathering of existing rocks prepare them for erosion, bringing the new products to a deposition, then they are broken down more during transport = sediment. Mechanical & chemical weathering are the raw materials for formation of the rock. They accumulate at the bottom, then become cemented together after a long time, mineral matter goes in between the other spaces and they end up forming solid rock. Geologists assume that 5% (volume) of the earths outer 16 km is sedimentary rock. They are thin and have a discontinuous layer, in the upper most portion of the crust. It reveals past environments that existed at the surface, indicating the where they were deposited, the mechanics involved, containing fossils and are important to the economy. Diagenesis: chemical, physical, biological changes that take place before metamorphism. It occurs between 150 and 200 degrees (cannot go past this because of metamorphism) Types of environment: continental: erosion and deposition associated with streams.
