1. 3. Wind Erosion

2. Common in Dry Climates (deserts) and along shorelines

3. Dunes Dunes – gentle slopes faces the wind Wind only pick up and carry clay, silt and sand

4. WIND

5. desert wind erosion pitted

6. 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

9. Cross bedded deposits

11. deposits from ripples and dunesdunes indicate that the depositional environment was either water or winddepositional environment

12. 4. WAVES

14. ABRASION

15. Longshore Current Movement of sediment parallel to the shore as waves strike shoreline at an angle Waves hit at an angle, water washes back

16. 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

17. Mass Movement

18. Mass Movements –The downslope movement of large masses of earth materials due to _______ gravity

19. Three Main Types  Creep  Landslides  Mudflows

20. Creep Gradual downhill movement of soil Slow process Evidence: (tilted fences, utility pole, bent trees)

22. 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

23. Slump La Conchita, CA Spring 1995

24. Rockslide Porteau Cove, B.C July 30, 2008

25. Tully Landslide April 27, 1993

26. Mudflow Cause - Fine-grained sediment becomes saturated with water and begins to flow Likely to occur on steep slopes Fast and destructive

27. Mt. Saint Helen’s, WA, Lahar March 21, 1982