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Landslides

Exam 3

QuestionAnswer
What is rock fall? Dislodging of a rock from a steep slope or cliff; DOES NOT slide
What can rock falls produce? Steep piles called talus (loose rock)
What is rock slide? Sheets of rock, or rock avalanche, travelling en masse down a slope; Rocks stay attached to ground as they move
Where do rock slides occur? Sloping rock beds; TILTED rock beds
What is a slump? Downward rotation of rock or soil along a curved surface
What is the scarp of a slump? Cliff, often at the back of the slump and curved
What is the toe of a slump? Bottom of the slump
What is the difference between a mudflow and debris flow? The size of the materials (grain size) Mudflow = small, debris flow = big (rocks, boulders)
What is a flow? Materials flow downhill in a “slurry” of soil, rock, water Water most important
What is a creep? Movement of regolith slowly downslope; Often result of expansion and contraction, either water or freeze thaw
What are landslides? Gravity pulls materials down slope
What does the angle of the slope mean for landslides? Steeper slopes = more likely for landslides to occur
What is the angle of repose? Maximum angle sediment can pile up before failure
What is the effect of a small amount of water on landslides? Water surface tension can still materials together and make it harder to flow
What is the effect of a large amount of water on landslides? The surface tension breaks
What triggers these mass movements? Increased rainfall, Earthquakes, human influence
What does vegetation do for soils? Helps stabilize soils
Created by: user-1965680
 

 



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