Lecture 15 - Chapter 15 Mass Wasting: The Work of Gravity...

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Chapter 15 Mass Wasting: The Work of Gravity Mass wasting and landform development Mass wasting refers to the down slope movement of rock, regolith, and soil under the direct influence of gravity Mass wasting is NOT an Erosion, but they often act together and shape the land surface Role of mass wasting Geologic process that often follows weathering Combined effects of mass wasting and running water produce stream valleys Slopes change through time No minimum angle is required for mass wasting to occur Most rapid and spectacular mass-wasting events occur in areas of rugged, geologically young mountains Mass wasting and erosional processes slowly lower the land surface Controls and triggers of mass wasting Triggers : 1. Water – “lubricating” effect Diminishes particle cohesion (friction) Water adds weight 2. Oversteepening of slopes – slope angle Angle of repose – is a steepest angle of a slope at which material remains stable. It is
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This note was uploaded on 04/26/2009 for the course GEOL 101 taught by Professor Olinsky during the Spring '08 term at Texas A&M.

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Lecture 15 - Chapter 15 Mass Wasting: The Work of Gravity...

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