i09weathering

i09weathering - Weathering and Mass Movement Weathering...

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10/17/2008 1 Weathering and Mass Movement • Weathering – Breaking up of rocks •E ros ion – Transporting material downslope – Usually linear action • Denudation – Gradual reduction of relief – ~ weathering + erosion Hard Quartz Clay Minerals Muscovite Potassic feldspar Biotite Sodic feldspar Amphibole Pyroxene Calcic feldspar Olivine Soft Weathering • Process by which rocks break down into smaller pieces • Two Primary Types:
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10/17/2008 2 Weathering Environments Mechanical Weathering • Destruction of rock through physical stresses • Rocks break into small pieces – surface area of rock increases – even greater weathering • Types: – Frost Wedging – Impact of Roots – Temperature Fluctuations – Salt Crystal Growth Salt Crystal Growth – Exfoliation Frost Wedging • Most common form of mechanical weathering • Water flows into joints (fractures) in rock Expands 9% when it freezes • Expands 9% when it freezes • Stress cracks rock
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i09weathering - Weathering and Mass Movement Weathering...

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