1. Wind
SWBAT describe conditions that contribute to the likelihood that an area will experience wind erosion; identify wind-formed landscape features; describe how dunes form and migrate; explain the effects of wind erosion on human activities

2. What is unusual about the surface of these rocks?
What do you think shaped these rocks?

3. Wind Erosion and Transport
Two methods for wind to move sand
Suspension
Wind lifts and keeps the particles airborne for a long distance
Saltation
Particles bounce along the ground

4. Wind Erosion and Transport
Where does wind erosion primarily occur?
Wind erosion is most common in areas with little vegetative cover, semi-arid areas, as well as seashores or lakeshores

5. Wind Erosion and Transport
Deflation
The lowering of the land surface as a result of surface particles being removed by wind
Abrasion
Occurs when particles such as sand rub against the surface of rocks or other materials

6. Wind Erosion and Transport
Why is sand such an effective agent of wind erosion?
Sand is generally made up of quartz, which is a very hard mineral that can scratch away at surfaces
Ventifacts
Rocks shaped by wind blown sediments

7. Wind Deposition How is wind deposition similar to water deposition?
They both erode sediments, and the sediments are dropped when they slow down
Dune
A pile of wind-blown sand that accumulates on an object

8. Dune Formation What conditions determine a sand dunes shape?
Sand availability
Wind velocity
Wind direction
Amount of vegetation

9. Dune Formation Barchan Transverse Parabolic Longitudinal
Solitary, crescent-shaped dunes
Form in flat areas with little vegetation
Long series of ridges that are perpendicular to the wind
Form in areas with lots of sand and strong steady winds
Form in humid areas between clumps of plants
U shaped
Long series of ridges that are parallel to the wind
Form in areas with limited sand and strong prevailing winds

10. Wind Deposition
Loess
Thick wind blown deposits of silt and fine sediment

11. Get Your Lab Notebooks In your groups complete the minilab on page 194
Title: Where does wind erosion occur
Using the map on page 192, answer the 3 analyze and conclude questions in complete sentences.
When you finish you may start the assessment questions 1-6 on page 197, you may work in your groups