Wind as an Agent of Change

1. Wind as an Agent of Change

2. Practice Bell Quiz • 1. Winds of at least _________ km/h are needed to move sand grains. • 2. The side of a ventifact that faces the steady wind direction wears into a smooth flat surface called a __________. • 3. If the bottom of a blowout reaches the water table, what can stop further deflation? ____________ • 4. How is loess different from sand? (Compare grain size and travel mechanism)

3. 5. The ends of a barchan sand dune point ____________. • 6. The ends of a parabolic sand dune point ____________. • 7. A transverse sand dune is ______________ to the direction of the wind, where as longitudinal sand dune is ____________. • 8. Another name for the leeward side of a sand dune is _____________.

4. Dust Storm in Texas

5. Ventifacts:

7. Mushroom or Toadstool Rocks

8. Desert Pavement

9. Blowouts

10. Loess in China

11. Four Types of Sand Dunes Parabolic Barchan Longitudinal Transverse

12. Ripples on Windward side Steep slope on Leeward side

13. Migration of Sand Dunes

14. Have a good