QUESTIONS AND ANSWERS |
100% PASS
Slope failures often occur during or after periods of high rainfall because: -
🧠 ANSWER ✔✔greater weight of water increases the shear force
In lecture, we talked about the La Conchita, CA earthflow that happened in
1995, and how difficult it was to clean up the debris without further
destabilizing the slope. As a follow up, your book explains what happened
,10 years later: - 🧠 ANSWER ✔✔heavy rains mobilized a deadly debris flow
from the old flow
Moisture between sediment grains on a slope:
(Hint: Think about building a sand castle on the beach) - 🧠 ANSWER
✔✔can promote stability if present in small amounts
One of the differences between a slide and a flow is that: - 🧠 ANSWER
✔✔a flow has more water
Is the slope in this image is best described as: (for photo check screenshot)
- 🧠 ANSWER ✔✔unstable and moving slowly due to creep
In the section on mitigation, the text explains that the advantage of creating
retaining walls out of loose rock behind mesh rather than solid wall is: - 🧠
ANSWER ✔✔it is able to shift slightly to accommodate points of stress
A good strategy for preventing slides of the top-most rock layers in hard-
rock setting is: - 🧠 ANSWER ✔✔supporting the slopes with a retaining wall
or by adding large bolts
Humans can increase the likelihood of sinkholes by: - 🧠 ANSWER ✔✔all of
these
,In a flat region where the rocks consist mostly of marble, which of the
following is most likley? - 🧠 ANSWER ✔✔sinkholes
Which of the following occurs most rapidly? - 🧠 ANSWER ✔✔a cover-
collapse sinkhole
True or false: Almost all skiers caught in snow avalanches are skiing
outside of marked and maintained slopes - 🧠 ANSWER ✔✔True
One of the examples of slides illustrated in this chapter is near the coastal
town of Point Fermin. In this case, the bluff is being made unstable by: - 🧠
ANSWER ✔✔a clay unit and an unsupported underwater cliff
Which of the following is true of landslides? - 🧠 ANSWER ✔✔They can
obbur both on land and on the ocean floor
Match the following mass-wasting types with their relative speeds: - 🧠
ANSWER ✔✔Fast = Earth flow
Slow = Creep
Look carefully at the image. Based on visual evidence, the type of mass
wasting in the photo is best described as a: (see screenshot) - 🧠 ANSWER
✔✔creep
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, Humans can increase the occurrence of slope failures by: - 🧠 ANSWER
✔✔Removing vegetation
A good strategy for preventing slides of the top-most rock layers in a hard-
rock setting is: - 🧠 ANSWER ✔✔supporting the slopes with a retaining wall
or by adding large bolts
Which of the following is true of sinkholes and landslides? - 🧠 ANSWER
✔✔Sinkholes tend to occur when the water table is lowered and landslides
tend to occur when the water table rises.
Fires are strongly influenced by weather conditions, but large fires can
create their own weather. Thunderstorms created by fire called: - 🧠
ANSWER ✔✔pyrocumulus clouds/ pyrocumulus storms
Downslope winds have many regional nicknames - Santa Annas, Diablos,
Chinooks. They can rapidly elevate fire risk by: - 🧠 ANSWER ✔✔pushing
very warm, dry air from high elevations to lower elevations
Understanding how local wind patterns change daily is crucial to knowing
how a fire will move through an area. - 🧠 ANSWER ✔✔wind blows from the
ocean towards the land during the day, and from the land out to sea at
night