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Geology Chapter 6 Notes

by: Erica Watts

Geology Chapter 6 Notes 41072 - GLG 110 - C

Erica Watts

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About this Document

Chapter of weathering and soils
Principles of Geology
Douglas R Gouzie
Class Notes
rocks, Geology, minerals, weathering, soils
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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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