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1013-001%2014%20-%20Ch%203%20Weathering%20%26%20Mass%20Wasting%20-%20Part%202

1013-001%2014%20-%20Ch%203%20Weathering%20%26%20Mass%20Wasting%20-%20Part%202

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GEO 1013 Third Planet Ch 3 - Weathering & Mass Wasting
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Types of landslides Flows – particles move independent of each other Creep – slow movement, often of unconsolidated sediment (soil creep) Debris flow – more than ½ the particles larger than sand sized, speed varies Earth/mud flow – movement of fine-grained particles and water
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Types of landslides Slide – material moves as a coherent mass Slump – downward slipping of Earth materials, usually involves a rotation on concave surface Rockslide – generally rapid movement of detached bedrock Fall – material free falls Very steep slopes, cliffs
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FLOWS
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During creep, the land surface moves more rapidly than deeper layers, so objects  embedded in rock or soil tilt downhill.
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If a hillside creeps as a tree  grows, the tree develops pistol  butt.
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SLIDES
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In slump, blocks of soil or rock remain intact as they move downslope. 
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Trees tilt back into the hillside on this slump along the Quesnell River, British Columbia.
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FALLS
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Rockfall commonly occurs in spring or fall when freezing water dislodges rocks from  cliffs. 
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Undercutting of cliffs by waves, streams, or construction can also cause rockfall.
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