1. Which type of mass movement has a very slow rate of downslope motion caused b
ID: 117027 • Letter: 1
Question
1. Which type of mass movement has a very slow rate of downslope motion caused by freeze-thaw cycles?
a. Avalanche
b. Slump
c. Mudflow
d. Rock fall
e. Creep
2. In which type of mass movement does regolith slip as a coherent mass down a curved failure surface?
a. Slump
b. Creep
c. Rock slide
d. Mudflow
e. Lahar
3. The principal difference between a debris flow and a mudflow is ________.
a. the shape of the path taken by the moving mass
b. the grain size of the moving mass
c. "that a debris flow contains abundant water, whereas a mudflow is dry"
d. that a debris flow contains pyroclastic debris from a volcanic eruption
4. A mudflow or debris flow created by the mixing of volcanic ash with melting snow and ice is called _____.
a. an avalanche
b. a slump
c. a debris avalanche
d. a lahar
e. solifluction
5. Underwater avalanches of suspended sediments are called _______.
a. Subaqueous avalanches
b. Turbidity currents
c. Lahars
d. Debris avalanches
e. liquefaction
6. "For dry, fine-grained sediments, the angle of repose is typically between ________ degrees."
a. 10 and 17
b. 15 and 22
c. 20 and 27
d. 30 and 45
e. 45 and 60
7. Which of the following would be unlikely to initiate a slope failure?
a. shaking from earthquakes
b. undercutting a slope
c. removal of vegetation
d. a light rainfall event
e. torrential rain
8. Undercutting of a sea-side cliff by wave action will most likely cause what kind of mass movement?
a. creep
b. solifluction
c. sinkhole
d. rock fall
e. avalanche
9. Evidence of slope instability and the development of a large slump includes:
a. bulges in the soil downslope
b. boulders piled at the edges of fields
c. visible cracks in the soil upslope
d. all of the above
e. a and c only
10. Curved tree trunks are usually an indication of what kind of mass movement?
a. creep
b. landslide
c. mudflow
d. rock fall
e. sinkhole
Explanation / Answer
1. Option e is correct
An extremely slow, imperceptible downslope movement of soil and rock debris, often caused by (1) freezing and thawing in cooler climates, (2) or wetting and drying cycles in warmer climates. Movement or tilting of surface landmarks over time is evidence that creep has occurred. Although creep is the least visible and seemingly most
benign, non life-threatening type of mass movement, it is responsible for more economic loss through foundation, roadway, etc. damage than any other forms.
Related Questions
Navigate
Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.