2. Which of the following slope movements could be triggered by heavy rainfall or snowmelt?
Choice 1 A block glide.
 Choice 2 A slump.
 Choice 3 A debris flow.
 Choice 4 A debris avalanche.
 Choice 4 None of the above.

REVIEW QUESTIONS FOR SLOPE MOVEMENTS

Instructions: underlined and colored text is linked to an image that will help explain the concept in question. These images are popup windows that should be closed when you are done. To choose an answer, click the mouse on a blue button. A popup message will appear to indicate whether your choice is correct or not. Sometimes a popup message will also take you to another image when you click on OK. To escape these images, you must close the popup window.

 

 

 

 

 

 

 

 

 

1. Which of the following mass movements would be most likely to occur as a result of adding weight to the head of a slope?

Choice 1 A block glide.
 Choice 2 A slump.
 Choice 3 A debris flow.
 Choice 4 A debris avalanche.
Choice 4 None of the above.

 

 

 

 

 

 

 

 

 

 

3. Under what conditions could the addition of weight to a slope trigger a block glide?
Choice 1 When the slope is composed of unconsolidated materials (e.g., soil or sediment).
 Choice 2 When the potential slip plane is dipping away from the valley.
 Choice 3 When there is cohesion present along the potential slip plane.
 Choice 4 When the slope has just experienced a fire.
 Choice 4 None of the above.


 

4. Soil creep:
Choice 1 occurs only on moderately steep to steep slopes.
 Choice 2 creates "tracks" or "chutes" along hill slopes.
 Choice 3 is most effective in dry, desert environments.
 Choice 4 can cause damage to human structures.
 Choice 4 All of the above are correct.

 

 

 

 

5. Debris flows:
Choice 1 can be prevented by removing vegetation (and thus weight) from a slope.
 Choice 2 usually occur during the driest season of the year, when the water table is lowest.
 Choice 3 typically have a threshold relationship with rainfall duration.
 Choice 4 are the result of alternating freezing and thawing of unconsolidated slope materials.
 Choice 4 None of the above is true.

 

 

 

6. The Portuguese Bend Landslide:
Choice 1 was, technically speaking, not a true landslide.
 Choice 2 occurred as a result of above-average rainfall.
 Choice 3 was proven to be the result of road construction.
 Choice 4 occurred as a result of below-average rainfall.
 Choice 4 might have occurred even if road construction had not occurred.

 

7. Debris flows and soil erosion by water:
Choice 1 differ mostly in terms of their ratios of water to solids.
 Choice 2 both result in the downslope movement of soil or other unconsolidated materials.
 Choice 3 are both enhanced by the same environmental conditions (e.g., steep slopes devoid of vegetation).
 Choice 4 All of the above are correct.