1. TYPES OF EROSION © Copyright 2004 - 2005. M. J. Krech. All rights reserved.

2. WHAT IS EROSION ?

3. Erosion is the movement of weathered rocks and soil particles from one place to another.

4. THERE ARE FIVE AGENTS OF EROSION. GRAVITY GLACIERS WIND WATER WAVES

5. GRAVITY EROSION CAUSED BY GRAVITY IS CALLED MASS WASTING.

6. Gravity: Rapid Mass Wasting One type of rapid mass wasting is LANDSLIDE which is the tumbling of dry soil and rocks downhill

7. Gravity: Rapid Mass Wasting Another type is MUDFLOW where rain mixes with the soil to form mud which moves downhill

8. Gravity: Slow Mass Wasting One type of slow mass wasting is EARTHFLOW where a mass of soil and plant life begin to slowly move downhill after a heavy rain.

9. Gravity: Slow Mass Wasting Another type is CREEP where soil particles move slowly downhill. This is the slowest.

10. GLACIERS A GLACIER is a large mass of moving ice and snow.

11. WIND Wind moves soil by DEFLATION where wind removes loose material from the land. Here smaller sand grains are blown away from around larger rocks.

12. WATER Running water is the major cause of erosion. Water picks up and carries loose particles of soil as it moves downhill.

13. WATER Water starts out in tiny grooves called RILLS

14. WATER Rills become wider and deeper, called GULLIES

15. WATER Gullies turn into STREAMS which turn into RIVERS.

16. WAVES Waves carry off small rocks and sand from the beach.

17. EROSION What is the agent of erosion in this picture? (Answer on next slide) A.

18. EROSION What is the agent of erosion in this picture? A. Water B.

19. EROSION What is the agent of erosion in this picture? B. Gravity C.

20. EROSION What is the agent of erosion in this picture? C. Water and waves D.

21. EROSION What is the agent of erosion in this picture? D. Waves E.

22. EROSION F. What 3 types of erosion are taking place? E. Wind © Copyright 2004 - 2005. M. J. Krech. All rights reserved.

23. THE END F. Wind Water Gravity © Copyright 2004 - 2005. M. J. Krech. All rights reserved.