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111-pp14 - UNIVERSITY OF SOUTH ALABAMA Last Time(Online...

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1 GY 111: Physical Geology GY 111: Physical Geology UNIVERSITY OF SOUTH ALABAMA Lecture 13: Sedimentary Rocks Part 1 Lecture 13: Sedimentary Rocks Last Time (Online Lecture) 1) Mineral Stability 2) Types of weathering (Physical, Chemical, Biological) 3) Chemical weathering reactions 4) Soils Bowen’s Reaction Series Mineral Stability Least stable at the surface Most stable at the surface Weathering: the breakdown of rocks at the surface of the Earth. There are 3 types of weathering: Weathering 1) Physical – mechanical reduction in the size of rock components. 2) Chemical – chemically- induced changes in the composition of rock. 3) Biological – a bit of both Chemical Weathering 1) Dissolution/Solution 2) Oxidation (reaction with oxygen) 3) Hydrolysis (reaction with water) Chemical Weathering
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2 Soil Profiles B A C Types of Soils Soils come in many different flavors, but Geology students in GY 111 only have to worry about 3 types.
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