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Lecture 5

Lecture 5 - Weathering

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

Description
Lecture 5 NotesWeathering Mechanical Weatheringy Breaking up rock into smaller pieces providing more surfaces for chemical attack y Mechanisms y Physical Weathering o Frost WedgingWater freezes in rock fractures and expands 9 prying rock apartOccurs in high altitude low temperature areasBroken off material called a talus slope o UnloadingPressure release ock surface expands after stuff on top is removed slabs breakoff o Biologic ActivityPlant roots grow in rock fractures and pry the fractures openAlso known as root wedging y Chemical Weathering o DissolutionDissolveCO2 dissolves in water to make weak carbonic acid that dissolves
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