Lecture 14 Soils and Environment

Lecture 14 Soils - 1 Lecture 14 Soils and Environment Sculpturing of the Earth Surface Accomplished by • Weathering • Transportation •

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Unformatted text preview: 1 Lecture 14: Soils and Environment Sculpturing of the Earth Surface Accomplished by • Weathering • Transportation • Deposition End products • Soils • Sedimentary Rocks 2 Lecture 14: Soils and Environment • Weathering – the physical breakdown (disintegration) and chemical alteration (decomposition) of rock at or near Earth’s surface +/- • Erosion – the physical removal of material by mobile agents such as water, wind, ice, or gravity Process of soil formation involves: 3 Lecture 14: Soils and Environment Two types : • Mechanical weathering – breaking of rocks into smaller pieces without changing the mineral components • Chemical Weathering - chemical transformation of rock into one or more new components Weathering: 4 Lecture 14: Soils and Environment Mechanical weathering : • Breakdown results in an increase in surface area available for chemical weathering Weathering: 5 Lecture 14: Soils and Environment Mechanical Weathering: 1. Frost wedging or salt wedging: 2. Unloading: Weathering : 1 6 Lecture 14: Soils and Environment Mechanical Weathering: 3.Thermal expansion 4.Biological activity Weathering: 7 Lecture 16: Soils and Environment 1 Chemical Weathering: 8 Lecture 14: Soils and Environment • Mechanical weathering – increased surface area • Rock characteristics – jointing (cracks in the rocks) – Mineralogy •...
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This note was uploaded on 01/19/2012 for the course EARTH SCIE 1081 taught by Professor Samrussell during the Fall '11 term at UWO.

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Lecture 14 Soils - 1 Lecture 14 Soils and Environment Sculpturing of the Earth Surface Accomplished by • Weathering • Transportation •

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