WeatheringSoil

WeatheringSoil - Chapter 5 Weathering and Soil Weathering...

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Chapter 5 Weathering and Soil Weathering – breaking down of rocks by physical, chemical, or biological means. Erosion – transportation of weathered material, usually by water, wind, or ice. Regolith – fragments of rocks and minerals, the products of weathering Mechanical/physical weathering – breaking down rocks by physical means. Breaks the rock into smaller and smaller pieces. Aids other types of weathering by increasing surface area to which organisms and chemicals have access. Types of mechanical weathering Tumbling in a stream (impact and abrasion) Abrasion by wind Frost wedging (water increases in volume when it freezes, widens cracks) Sheeting/exfoliation/unloading – Release pressure from an igneous/metamorphic rock, and it separates into sheets. Can create an exfoliation dome. Thermal expansion – daily heating/cooling Root wedging – roots widen cracks in rocks Chemical weathering – breaking down rocks by chemical means. Can involve simple dissolution (dissolving) of mineral, or true chemical reactions. Types of chemical weathering
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This note was uploaded on 01/17/2012 for the course GEOL 1054 taught by Professor Dr.bethrinard during the Fall '09 term at Tarleton.

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WeatheringSoil - Chapter 5 Weathering and Soil Weathering...

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