1. Wind

2. Wind is different than water when it comes to erosion. Why? Wind can carry small materials uphill/upslope

3. Extreme winds can carry particles that are large! Tornados Hurricanes

4. Wind movements happens two ways: Airborne Rolling action

5. Suspension is the term associated with airborne movement

6. Saltation is the term that describes the rolling action of larger particles

7. Generally, most of the movement of materials by wind occurs in areas of low precipitation, and minimal plant growth Rule of Thumb

8. Deflation is the lowering of the land by removal of particles by the wind Previous ground level

9. Desert pavement is what is left when steady winds have removed small particles and leave larger particles

10. Abrasion is the process of wind blown particles wearing away at surfaces of rocks and other features Flute-like textures on the rock, possibly caused by wind abrasion, are clearly visible.

11. This process works because most of the sand particles are made of quartz that is quite hard Polishing of rocks can take place because of this process

12. Sandblasting and Abrasion Wind can only lift sand to about 1 meter high - results in “ Mushroom Rock ” Frosted or Pitted sediments – rocks with flat sides

13. Ventifacts are rocks that have been shaped by wind blown sediments

15. Wind Deposition Sand and sediments accumulate around objects that break the flow of wind Vegetation helps do this!

16. Dunes are the results of these deposits

17. SAND DUNES are ridges of wind deposited sand - Usually 3 to 15 metres high, but can reach 180 metres - A continuously changing dune is ACTIVE Corbis Digital Stock

18. Dune conditions are dependent on the following Availability of sand Wind velocity Wind direction Vegetation present

19. Structure of a Sand Dune Windward side Leeward side Wind direction

21. TYPES OF SAND DUNE 1.) BARCHAN - most common type - crescent-shaped Wind direction backslope slip face

22. 2.) PARABOLIC DUNES - crescent-shaped but with the concave side on the windward side - usually elongated - may develop in associated with deflation hollows Wind direction

23. 3.) TRANSVERSE DUNES low sand ridge at right angles to the wind direction may form because of large amounts of sand wind

24. 4.) LONGITUDINAL DUNES low sand ridges parallel to the wind direction may form because of a limited amount of sand also known as seif dunes wind

25. Loess Silt and clay particles that are deposited by the wind Wisconsin is a state that has large buildups of loess

26. Loess, as seen in a soil horizon

27. LOESS Finely textured sediment wind-blown long distances Wind-blown glacial debris formed large deposits