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Unformatted text preview: Professor Ohan Chapter 7 1- Sedimentary rock is a type of rock that is formed by sedimentation of material at the Earth's surface and within bodies of water. Sedimentation is the collective name for processes that cause mineral and/or organic particles ( detritus ) to settle and accumulate or minerals to precipitate from a solution . 2- Particles that form a sedimentary rock by accumulating are called sediment . Before being deposited, sediment was formed by weathering and erosion in a source area, and then transported to the place of deposition by water , wind , mass movement or glaciers which are called agents of denudation. 3- The sedimentary rock cover of the continents of the Earth's crust is extensive, but the total contribution of sedimentary rocks is estimated to be only 5% of the total volume of the crust. Sedimentary rocks are only a thin veneer over a crust consisting mainly of igneous and metamorphic rocks . 4- Sedimentary rocks are deposited in layers as strata , forming a structure called bedding . The study of sedimentary rocks and rock strata provides information about the subsurface that is useful for civil engineering , for example in the construction of roads , houses , tunnels , canals or other constructions. Sedimentary rocks are also important sources of natural resources like coal , fossil fuels , drinking water or ores . 5- The study of the sequence of sedimentary rock strata is the main source for scientific knowledge about the Earth's history , including palaeogeography , paleoclimatology and the history of life . 6- The scientific discipline that studies the properties and origin of sedimentary rocks is called sedimentology . Sedimentology is both part of geology and physical geography and overlaps partly with other disciplines in the Earth sciences , such as pedology , geomorphology , geochemistry or structural geology ....
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This note was uploaded on 02/05/2012 for the course GEOLOGY 101-101 taught by Professor Ohan during the Spring '11 term at CUNY City.
- Spring '11