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Published byBaldric Long Modified over 9 years ago
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3. Wind Erosion
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Common in Dry Climates (deserts) and along shorelines
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Dunes Dunes – gentle slopes faces the wind Wind only pick up and carry clay, silt and sand
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WIND
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desert wind erosion pitted
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Sand Blasted and Pitted Rock Sand can only be picked up, up to 3 feet so lower parts get eroded away also get pitted rocks
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Cross bedded deposits
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deposits from ripples and dunesdunes indicate that the depositional environment was either water or winddepositional environment
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4. WAVES
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ABRASION
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Longshore Current Movement of sediment parallel to the shore as waves strike shoreline at an angle Waves hit at an angle, water washes back
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http://www.youtube.com/watch?v=U9EhVa 4MmEshttp://www.youtube.com/watch?v=U9EhVa 4MmEs http://www.youtube.com/watch?v=zEpfjyto 8r0&list=PLB177833E87DA5C20http://www.youtube.com/watch?v=zEpfjyto 8r0&list=PLB177833E87DA5C20
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Mass Movement
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Mass Movements –The downslope movement of large masses of earth materials due to _______ gravity
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Three Main Types Creep Landslides Mudflows
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Creep Gradual downhill movement of soil Slow process Evidence: (tilted fences, utility pole, bent trees)
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Landslides Sudden and rapid downhill movement Likely to occur on steep slopes Caused by high precipitation which “lubricates” sediment (deceases friction) http://www.youtube.com/watch?v=ZVYGJYnJTi0 http://www.youtube.com/watch?v=S1Pi64I2wTU
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Slump La Conchita, CA Spring 1995
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Rockslide Porteau Cove, B.C July 30, 2008
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Tully Landslide April 27, 1993
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Mudflow Cause - Fine-grained sediment becomes saturated with water and begins to flow Likely to occur on steep slopes Fast and destructive
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Mt. Saint Helen’s, WA, Lahar March 21, 1982
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