Wasting away....
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Wasting away......as long as there's gravity and weather...

Click on the following links, read the information, and otherwise follow directions and answer questions.

Your answers to these questions are due at the end of the period today!

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This page pretty well covers the questions below and will be your primary source for answers...

Mass Wasting


This page is awesome for information AND photographs and graphics:

Introduction to Mass Wasting...


This website also does a good job explaining concepts of Mass Movements..

Pamela Gore's Georgia Perimeter College page on Mass Wasting...


1. What is regolith?

2. What is mass wasting?

3. Why is it that material has to be on a slope for mass wasting to occur?

4. What does the perpendicular component of gravity do on a slope?

5. What does the tangental component of gravity do on a slope?

6. What happens when the sheer stress becomes greater than the combination of forces holding the object on the slope?

7. Down-slope movement is favored by what 2 factors?

8. Define "angle of repose".

9. In general, the angle of repose for dry materials increases with increasing grain size, but usually lies between what angles?

10. Why is it that slightly wet unconsolidated materials exhibit a very high angle of repose?

11. When the material becomes saturated with water, the angle of repose is reduced to very small values and the material tends to flow like a fluid. Why?

12. The down-slope movement of material, whether it be bedrock, regolith, or a mixture of these, is commonly referred to as what?

13. A sudden failure of the slope resulting in transport of debris down hill by sliding, rolling, falling, or slumping is called what?

14. Material flows down hill mixed with water or air are called what?

15. Types of slides wherein downward rotation of rock or regolith occurs along a curved surface are called what?

16. What events usually trigger slumps?

17. An accumulation of fallen material at the base of most cliffs is called what?

18. The slope of the talus is controlled by what?

19. Why is the angle of repose of talus usually greater than it would be for sand?

20. What happens during rock slides and debris slides?

21. Sediment flows that contain between about 20 and 40% water are called what?

22. At what point do slurry flows grade into streams?

23. Fluid-like behavior in granular flows with little or no water are caused by what?

24. A slurry flow travelling at 50 m/hr would be called a what?

25. Why are mudflows potentially very dangerous?

To help out...

Mass Wasting resource...



USGS Mass Wasting part 2...




Richard Harwood's page




More resources from the RESGI













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Lowell Bailey

Bedford-North Lawrence High School
595 N. Stars Boulevard
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