Geology Chapter 6 Notes
Geology Chapter 6 Notes 41072 - GLG 110 - C
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This 2 page Class Notes was uploaded by Erica Watts on Sunday February 14, 2016. The Class Notes belongs to 41072 - GLG 110 - C at Missouri State University taught by Douglas R Gouzie in Fall 2015. Since its upload, it has received 23 views. For similar materials see Principles of Geology in Geography at Missouri State University.
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Date Created: 02/14/16
Chapter 6: Weathering and Soils Weathering: the physical breakdown and chemical decomposition Mass wasting: transfer of rock and soil downslope under the influence of gravity Erosion: physical removal of material by wind, water, ice and gravity Two types o Mechanical weathering: breaking of rock into smaller pieces o Chemical weathering: chemical breakdown of rocks Movement of the smaller pieces is not involved Don’t confuse weathering with erosion, which involves moving the smaller pieces around Physical Weathering (Mechanical) o Processes involved are… Frost wedging Sheeting-produces horizontal joints Exfoliation-may produce Exfoliation Domes Plant action- growth of plant roots Animal action Falling rock debris- talus Mechanical Weathering o Sheeting (exfoliation) of igneous and metamorphic rocks at Earth’s surface as a result of a reduction in confining pressure. o Salt crystal growth- sea spray or salty ground water fills crevices and pores in rocks; water evaporates; salt crystals form & enlarge crevices o Biological activity: disintegration resulting from plants and animals Chemical Weathering o Breaks down rock components and internal structures of minerals o Most important agent is water Responsible for transport of ions and molecules involved in chemical processes Major Processes of chemical weathering o Dissolution Aided by small amounts of acid in the water o Oxidation Any reaction when electrons are lost from one element o Hydrolysis The reaction of any substance with water Hydrogen ion attacks and replaces other ions Weathering o Alternations caused by chemical weathering Decomposition of unstable materials Formation or retention of stable materials Physical changes such as the rounding of corners or edges Rates of Weathering o Factors affecting weathering Surface area Rock characteristics
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