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Lecture 7

Earth Rocks Lecture 7.docx

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Department
Earth Sciences
Course
Earth Sciences 1022A/B
Professor
Stephen R Hicock
Semester
Winter

Description
Earth Rocks, Weathering & Soils Lecture 5  After rocks are formed, they are weathered when exposed at the surface; this prepares  material for transport by erosional processes in the rock cycle ­ Two main types of weathering include mechanical (disintegration) and chemical  (decomposition) that act together and enhance the effectiveness of each other Frost Wedging: Water freezes in rock fractures and expands 9%, prying rock apart Unloading: rock surface expands after stuff on top is removed, slabs break off Biologic Activity: plant roots grow in rock fractures and pry the fractures open Chemical Weathering Dissolution: CO2 dissolves in water to make weak carbonic acid that dissolves rock  minerals Oxidation: Dark silicates react with oxygen; form Fe, Mg oxides, clays Hydrolysis: orthoclase in granite changes to clay by exchanging large K ions for tiny H Rock Characteristics: Light silicates form closer to weathering conditions, more stabl
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