1. Wind Erosion

2. Take-Away Points 1.Wind erosion has little effect on solid rock 2.Wind mostly moves loose material 3.Sand dunes depend on strength and steadiness of wind and abundance of sand 4.Windblown silt is called loess 5.Loess is the raw material for many mollisols, the best agricultural soils

3. Abrasion Ventifacts or Dreikanters Polishing, Undercutting Streamlining (Yardangs) On Mars, with billions of years of only wind erosion, wind has had much greater effects 1.Wind erosion has little effect on solid rock

4. Ventifacts, Antarctica

5. Dreikanter, Wisconsin

6. Wind Abrasion, Independence Rock, Wyoming

7. Wind (Aeolian) Landforms Little Power to Attack Solid Rock Most Effective in Moving Loose Material Mechanisms Suspension (Silt) Saltation (Sand) Rolling 2. Wind mostly moves loose material

8. Wind (Aeolian) Landforms Deposition Dunes Loess Erosion Deflation Basins (Blowouts) Lag Deposits, Desert Pavement 2. Wind mostly moves loose material

9. Sand Dunes 3. Sand dunes depend on strength and steadiness of wind and abundance of sand

10. Longitudinal Dunes, Colorado

12. Longitudinal and Transverse Dunes, Colorado

13. Transverse Dunes, Sand Hills, Nebraska

14. Beach Dunes, Michigan

15. Barchans, Sand Hills, Nebraska

16. Snow Barchans, Wisconsin

18. Star Dune, Nevada

19. Great Sand Dunes, Colorado

22. Desert Pavement, California

23. Lag Deposit, Minnesota

24. Blowout, Wisconsin

25. Loess Silt-sized Derived from Glacial Outwash in U.S. Found in U.S., E. Europe, China Parent material of world’s prime agricultural soils –Available nutrients –Fine size – lots of surface area –Cohesive – good root support –Porous – retains water well –No Rocks!!!! 4. Windblown silt is called loess

26. Loess, Wisconsin

27. Loess in the U.S. Loess is the raw material for many mollisols, the best agricultural soils

28. Loess in Europe 5. Loess is the raw material for many mollisols, the best agricultural soils

29. Loess in China 5. Loess is the raw material for many mollisols, the best agricultural soils

30. Take-Away Points Wind has little effect on solid rock Wind mostly moves loose material Sand dunes depend on strength and steadiness of wind and abundance of sand Windblown silt is called loess Loess is the raw material for many mollisols, the best agricultural soils