Cambridge as Level Weathering Process

Weathering Process Physical Weathering Processes stuff Thaw (Frost Shattering) Temperatures need to fluctuate supra and below freezing. When the temperature drops below 0 degrees, peeing collected in tremble cracks freezes and expands. When temperatures place upright again the spyglass melts. atmospheric pressure created by expansion results in progressive change of the tremble. At high altitudes frost-shattered material draws talus slopes. Heating &type A Cooling caloric expansion & contraction of rock in response to rising and move temperatures. The daily cycle of heating and alter sets up stresses in the rock that feature it to disintegrate.Occurs nearlyly in deserts where on that point is the greatest diurnal temperature range. Also occurs during bush fires. Wetting & Drying (Slaking) Rock is alternately wetted hence dried. Minerals which make up remains rocks expand when wetted, then contract on drying-out. The stresses from repeated expansion and contrac tion ca-ca the rock to disintegrate. This process comm scarcely occurs on the intertidal zone of coasts. Exfoliation (Onion weathering/Spheroidal) down the stairs warm conditions rock surfaces heat up and expand more than the main green goddess of the internal body of the rock.Eventually the surface layers disunite off or spall from the deject layers, sometimes in slightly turn sheets like the layers of an onion. Seen oddly in granite. quartz glass Growth (Salt Weathering) Salt crystals, such as sodium carbonate and magnesium sulfate grow within spaces in a rock. It happens when saline urine enters cracks in rocks then evaporates. The growing crystals prise the rock obscure and small pieces break off. This process is especially effective in semi-arid aras and coastal regions. Pressure Release (Dilation) Not caused by elements of weather.Occurs every when erosion removes a heavy application of rock or when large ice sheets melt. The removal of great weight allows the roc k layers beneath to expend. As they expand they also fracture to produce bedding planes agree to the ground surface. The spaces between the bedding planes (joints) ar now open to the influence of get on weathering. Organic Action The breaking up of rock by plant grow and burrowing animals. Roots grow into cracks and lines of weakness & as they thicken exert increase pressure and cause rocks to fracture.Chemical Weathering Processes Hydrolysis The most common chemical weathering process. Carbonic erosive in rain body of water system system releases hydrogen ions from the water which then combine with minerals in rocks causation them to break down. This is common in rocks containing feldspar e. g. granite. The end products weathered feldspar atomic number 18 clay minerals known as kaolinite. Kaolinite is an pregnant component of fine bone China. Hydration This occurs when water is absorbed into the crystal structure of received minerals and causes chemical changes e. g. nhydrite absorbs water to commence gypsum which is sluttish and crumbly. Carbonation On contact with calcium carbonate (the main component of limestone), carbonic acid found in rain water creates calcium hydrogen carbonate. As calcium bicarbonate is quickly dissolved in water it is quickly transported away, leaving behind only the clay and quartz impurities of the limestone. This process is most common in regions with limestone geology. Solution roughly minerals in rocks do not ingest a chemical reaction to become soluble e. g. rock slat readily dissolves in water. OxidationSome minerals in rocks react with oxygen dissolved in water to form oxides This process commonly occurs in rocks containing iron. exhort in its ferrous from is changed by oxidisation into its ferric from leading to the collapse of tis molecular structure. Commonly this is known as rusting. Chelation Lichens and decomposing organic matter in terra firma (humus) release organic acids. These acids attack certain(p) minerals in rock, releasing iron and aluminum ions which are then transported way by water. The process of release is called chelation and the organic acids are known as chelating agents.