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18 Matching questions

  1. What caused the lahars (mudflows) in 1985 on the Nevado del Ruiz volcano?
  2. Consider a steep highway cut made by removing slightly weathered to fresh, fractured, granite bedrock. Which of the following situations is most stable against rockslides?
  3. A geologist wants to locate a horizontal coal bed on a soil-covered slope where soil creep is active. A distinctive sandstone bed underlies the coal bed. On the basis of weathered sandstone fragments in the soil, where is the coal bed?
  4. Which statement best describes slumping, a mass wasting process?
  5. As an erosional process, how is mass wasting unique from wind, water, and ice?
  6. Consider a weathered rock or soil particle lying on a slope. How will the gravitational force pulling the particle downward along the land surface vary with the inclination of the slope?
  7. The most rapid type of mass movement is a ________.
  8. During wet weather or times when snow is melting, sometimes the downhill toe of a slump ________.
  9. Which one of the following operates primarily in areas of permafrost?
  10. How do freezing, thawing, wetting, and drying contribute to soil creep?
  11. ________ denotes the exposed, crescent-shaped rupture surface at the head of a slump.
  12. How do the strength and cohesion of clay-rich regolith or soil change with the addition of water?
  13. Which of the following is the factor affecting mass wasting?
  14. ________ involves movement on a zone of compressed air and would most likely be triggered by an earthquake.
  15. All of the following are possible indicators that creep is occurring except for ________.
  16. Which mass wasting process has the slowest rate of movement?
  17. Which of the following was a major factor leading to the Gros Ventre, WY slide?
  18. Why was the Alaskan pipeline built above ground and insulated?
  1. a creep
  2. b Mass wasting does not require a transporting medium.
  3. c Soils and shallow bedrock were very wet and locally saturated.
  4. d an extremely thick soil profile
  5. e A block or blocks of unconsolidated regolith slide downhill along a curved slip surface.
  6. f A rock avalanche
  7. g just above the highest piece of sandstone seen in the soil.
  8. h Pyroclastic flows melt snow and ice near the summit.
  9. i solifluction
  10. j rock avalanche
  11. k One set of widely spaced, sub-horizontal fractures.
  12. l Water lowers the strength and cohesion.
  13. m It will decrease as the slope angle is lessened.
  14. n The soil expands and contracts, lifting particles and dropping them a slight distance downslope.
  15. o becomes an earthflow
  16. p Scarp
  17. q To protect the pipeline against damage due to thawing ground and to keep the crude oil hot and fluid.
  18. r all of the above