PPT-Weathering and Mass Wasting

Earth s external processes Weathering the physical breakdown and or chemical alteration of rock at or near Earth s surface Mass wasting the transfer of rock and soil . We focus here on the subsequent denudation of the region influenced strongly by the lithology and structure of the rocks This starts with the exploitation of tectonic structures which further distinguishes th e western Yorkshire Dales from the Lake 1 Mass Wasting The downslope movement of rock, regolith, and soil under the direct influence of gravity Gravity is the controlling force Mass WastingImportant triggering factors Weathering and Erosion. Shaping the Earth’s Crust. The rocks and soil of the earth’s crust are continually being worn down because of a number of processes.. These processes are known collectively as . Causes of mass wasting. Types of mass wasting. slumps. falls . slides. flows. Mass Wasting. . –. . downslope. movement of debris in response to gravity.. http://students.washington.edu/cdcdcd/. Week 6. Questions for Discussion. Would you live on a slope? If so, where?. What level of risk from mass wasting is acceptable to you? (How would you know if the slope risk was assessed accurately?). - slopes Mass wasting Is a collective term addressing all down slope movements of weathered rock (soil) that are created by gravitational forces.Gravity is the primary component!Vocabulary ColluviumS Weathering. Weathering is the process that breaks down rock and other substances at the Earth’s surface. . Heat, cold, water, and ice all contribute to weathering.. Repeated freezing and thawing for example can crack rock apart into smaller pieces. . Mechanics of Mass Wasting. . An . object resting on a horizontal . surface will move only when it encounters a force acting parallel . to the . horizontal surface. . . The . force . of . gravity . Topics of Discussion . What Is Wasting?. Defining HIV Wasting. . CDC Definition of HIV Wasting. Limitations for Diagnosis . Definitions of HIV Wasting in the HAART Era. Prevalence of HIV Wasting. Determinants of ≥ 5% Weight Loss Among HIV-Positive Participants in the NFHL Study: Final Multivariate Model . Weathering. Chemical Weathering. Hydration: chemical reaction that consumes H. 2. O [ 2KAlSi. 3. O. 8. 2H. 2. CO. 3. H. 2. O = Al. 2. Si. 2. O. 5. (OH). 4. 4SiO. 2. 2K. . 2HCO. 3. -. ]. Paleosols. In the Lake Superior Region. (map courtesy of Mark . Jirsa. ). Schematic Paleoweathering Profile. protolith. saprolite. regolith. The A-C*N-K Plot (molar). Chemical Index of Alteration (CIA). Unit 7 notes. Weathering. What is it?. Disintegration and Decomposition of rocks . Where does it happen?. At or near the surface of the Earth. Weathering. What does this process look like?. Weathering. Unit 7 notes. Weathering. What is it?. Disintegration and Decomposition of rocks . Where does it happen?. At or near the surface of the Earth. Weathering. What does this process look like?. Weathering. Weathering. Notes. Weathering. - The surface processes that break down rock into small pieces called sediment. . Two Types of Weathering. MECHANICAL WEATHERING. – . . Physical. processes that break rock into fragments with the .