chapter_09_lec modified - Mass Wasting Physical Geology...

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Steve Kadel, Glendale Community College Mass Wasting Physical Geology 11/e, Chapter 9
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Mass Wasting Mass wasting is downhill movement of masses of bedrock, rock debris or soil, driven by the pull of gravity Landslides have been far more costly in the U.S., in terms of both lives and dollars, than all other geologic and weather hazards combined…??? Mass wasting is, with proper planning, perhaps the most easily avoidable of all major geologic hazards
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Classification of Mass Wasting Types of movement Flow Descending mass moves downhill as a viscous fluid Slide Descending mass remains relatively intact, and descends along well-defined surfaces Translational slide - movement along plane parallel to motion Rotational slide ( slump ) - movement along a curved surface Fall Material free-falls or bounces down a cliff
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Classification of Mass Wasting Types of mass wasting are classified based on: Rate of movement Wide range from < 1cm/year to >100 km/hour
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