Sedimentary Rocks

dwelling house tectonics argon responsible for many of Earths natural occurrences. From vol notifyoes to earthquakes plate tectonics play be large role. Another natural occurrence that is not is discussed as much as vol can buoyoes and earthquakes is the formation of aqueous contestation. Plate tectonics also plays a major role in the formation of this type of tremble. Plate tectonics is a term that is used to describe how the unlike plates that make up the Earth give-up the ghost and the reactions that occur as they atomic number 18 moving. Before explaining how plate tectonics be related the c erstpt of sediments moldiness be understood.Sediments are pieces of solid material are deposited on Earths surface by agency of wind, water, ice, gravity or chemical precipitation. This occurs through weather and erosion (McClearly, 2005). As convergent plates motivate towards each other, one plate is subducted under the other plate and as this is occurring the plates are moving ac cumulated sediment and rocknrolls with them. Divergent boundaries also have an effect on aqueous rock. In divergent apparent motion the plates are moving away from each other and the young aqueous rock is pushed to the open border (Ryan, 2008).Sedimentary rock actually originates from the disposition of the sediments after they are moved by the movement of plates. The climate controls how sediments are moved and how the rock weather. After weathering and erosion has occurred the sediments stop moving and settle. Where they settle is cognize as their disposition. The origination of sedimentary work is a combination of natural processes that result in the disposition of sediment. The way the sediment is actually formed is a process known as Lithification.Lithification is physical and chemical processes which give up sediment is transformed into sedimentary rock. Lithification begins with compaction. The weight of sediments on top of other sediments forces the sediment grains cl oser together, which results in physical changes. The next process that occurs is through a chemical process known as cementation. Cementation occurs when mineral growth, in combination with high temperatures, cement sediment grains together into solid rock (McClearly, 2008). After sedimentary rock is formed then it is organized on the Earths surface.The pattern of organization is known as bedding. Bedding is the layered arrangement of strata in a group of sediment or sedimentary rock. Over time stratas that are adjacent to each other may look different because the mineral composition of the sediments in a specific location may changes or the way the sediments are transported or deposited may be different. The bedding surface, which is the boundary between adjacent strata, is the indication that rock was once sediment. Once sediments have been formed they are classified into three different categories.The first is clastic sedimentary rock. These rocks are formed from the sediment an d debris from weathering and erosion. There are four different types of clastic, conglomerate (gravel), sandstone (sand),siltstone (silt), and mudstone (mud) or shale. These four categories are characterized by the size of their particles. The next category of sedimentary rock is chemical sedimentary rock. These rocks are formed by precipitation of minerals dissolved in lakes, rivers or sea water. This precipitation can occur is two ways.The first is plants and creatures living in water can alter the chemical symmetry of the water which has an effect on the sediments. The second way is the evaporation of fresh water because of warm ironical climates, which leads to increased salinity, the salts become solid because they are not dissolving. The last category of sedimentary rock is biogenic sedimentary rock. These rocks are formed from sediments that are primarily composed of plant and animal remains. This can allow in the hard shells of animals as well as the bones and teeth.From plants this can include fragments of plant matter much(prenominal) as roots, wood and leaves (Murck, Skinner, Mackenzie, 2008). Since there are three categories of sedimentary rock differentiating in the three is important. one(a) way to tell the difference in the rock is the physical characteristics or physical location. Clastic rock is in the form of gravel, sand, slit or mud, which are all easily recognizable. Chemical sedimentary rock will be located in areas with water such as seas and lakes, since the chemical process which creates these rocks are done inside of water.Biogenic sedimentary rock is easily recognizable because these rocks will have pieces of animal or plant matter in them. Fossils can be carved out of these types of sedimentary rock (McClearly, 2005). Sedimentary rock is one type of rock that is located all over the world. From mountains to oceans sedimentary rocks can be found. With the combination of plate tectonics, weather and erosion sedimentary rocks are formed. Clastic, chemical and biogenic rocks are all very different but together they make up the category of sedimentary rocks.