Question 1

The type of slope failure shown in this photograph is:

Accepted Answer

A)  creep
B)  a rock slide
C)  a debris avalanche
D)  a debris flow
E)  all of theseF) C) and D)
G) A) and B)

Question 2

What type of slope failure is shown in this figure?

Accepted Answer

A)  creep
B)  debris flow
C)  rock fall
D)  rock slide
E)  rotational slideF) A) and E)
G) A) and B) B

Question 3

The joints in the photograph mimic topography,indicating that they formed:

Accepted Answer

A)  while the granite was still molten
B)  while the rocks were still buried at great depth
C)  when the weight of overlying rocks was unloaded,allowing expansion along the joints
D)  along a subduction zoneE) All of the above
F) A) and D)

Question 4

Which of the following is a way that slopes fail?

Accepted Answer

A)  large blocks fall from cliffs
B)  rocks,soil,sediment,and ice slides down steep hillsides
C)  pieces of loose rock accumulate on talus slopes until the angle becomes too steep
D)  soil and other loose material can flow rapidly down slopes,forming debris flows
E)  all of theseF) A) and C)
G) D) and E)

Question 5

What factors lead to the Viaont landslide disaster?

Accepted Answer

A)  a volcanic eruption shook the ground
B)  a major earthquake shook the ground
C)  the sedimentary layers dipped downslope toward the reservoir
D)  all of theseE) A) and C)
F) B) and C)

Question 6

Joints in the landscape:

Accepted Answer

A)  mostly form at depth and are uplifted to the surface
B)  can detach thin slices of rock parallel to the land surface
C)  cause highly jointed areas to be less resistant to weathering than more jointed ones
D)  all of theseE) None of the above
F) B) and C)

Question 7

Which of the following might indicate that slopes adjacent to this landslide might fail?

Accepted Answer

A)  they have the same steepness as the slope that failed
B)  they appear to have a similar geology setting
C)  one part of the slope has already failed
D)  all of theseE) A) and D)
F) A) and C)

Question 8

The layer of quartzite in this photograph would mostly weather by:

Accepted Answer

A)  dissolution
B)  hydrolysis
C)  physical weathering
D)  spontaneous combustionE) None of the above
F) C) and D)

Question 9

Which of the following does NOT physically loosen rocks on the surface?

Accepted Answer

A)  water contracting as it freezes
B)  crystals of salt and other minerals that exert an outward force on fractures
C)  roots that pry apart fractures as the root grows in size
D)  joints that form when rock pressures are released
E)  rodents and other burrowing organismsF) B) and D)
G) B) and E) A

Question 10

The landslide that destroyed La Conchita,as shown in this photograph,is probably:

Accepted Answer

A)  an example of creep
B)  an earth flow
C)  a rock fall
D)  a rock avalancheE) B) and D)
F) A) and D)

Question 11

As illustrated in this figure,which of the following is NOT potential trigger for slope failure?

Accepted Answer

A)  precipitation that can saturate and weaken sediment
B)  undercutting of steep slopes by roads and rivers
C)  shaking during an earthquake
D)  shaking of slopes and melting of snow during volcanic eruptions
E)  all of these are illustratedF) All of the above
G) B) and E)

Question 12

Which of the following is valid for how rocks weather?

Accepted Answer

A)  quartz is very soluble during weathering at low temperatures
B)  limestone weathers rapidly in wet climates but can form cliffs in dry ones
C)  as a granite weathers,quartz rapidly decomposes into clay minerals
D)  most minerals in granite weather at nearly the same rate and so granite has smooth surfacesE) A) and D)
F) B) and C)

Question 13

Which of the following is an expression of the angle of repose?

Accepted Answer

A)  talus slope
B)  some slopes of sand dunes
C)  angle of slopes on scoria cones
D)  all of theseE) A) and B)
F) B) and D)

Question 14

Which of the following factors caused some high peaks of the Cascade Mountains of the Pacific Northwest to have high potential for slope failure?

Accepted Answer

A)  they are volcanoes with steep slopes
B)  they experience heavy rainfall
C)  they may contain loose volcanic ash and other volcanic materials
D)  all of theseE) A) and B)
F) A) and C)

Question 15

Which of the following slope failures is most likely to cause large numbers of casualties?

Accepted Answer

A)  creep
B)  debris slide
C)  earth flow
D)  rotational slide
E)  rock avalancheF) All of the above
G) B) and E)

Question 16

Why does weathering of granite bedrock produce rounded shapes?

Accepted Answer

A)  the rounded shapes are pillows formed at depth in the granitic magma
B)  weathering removes corners and edges,as in spheroidal weathering
C)  burrowing animals eat away parts of the granite
D)  roots rub against the edges of the graniteE) B) and C)
F) A) and D)

Question 17

Which of the following is probably NOT important in assessing an area's potential for slope failure?

Accepted Answer

A)  comparing the geologic setting to adjacent areas that have or have not failed
B)  whether the material is loose sediment or solid bedrock
C)  recent changes in slope
D)  the orientation of layering and fractures
E)  all of these are importantF) C) and D)
G) C) and E)

Question 18

Which of the numbered soil horizons is most likely to have clay or calcium carbonate?

Accepted Answer

A)  1
B)  2
C)  3
D)  4
E)  5F) C) and D)
G) All of the above D

Question 19

How does material in soil move?

Accepted Answer

A)  the upper part of soil loses material downward
B)  clay minerals and other fine particles are carried downward
C)  chemical ions leached from above can accumulate in the underlying zone
D)  calcium carbonate can accumulate in the soil,especially in dry environments
E)  all of theseF) None of the above
G) A) and B)

Question 20

Which of the following slope failures is least likely to cause casualties?

Accepted Answer

A)  rock avalanche
B)  debris flow
C)  creep
D)  rock slide
E)  rock fallF) D) and E)
G) A) and B)

Exam 15: Weathering, soil, and Unstable Slopes

The type of slope failure shown in this photograph is:

Correct AnswerverifiedShow Answer

What type of slope failure is shown in this figure?

Correct AnswerverifiedB

The joints in the photograph mimic topography,indicating that they formed:

Correct AnswerverifiedShow Answer

Which of the following is a way that slopes fail?

Correct AnswerverifiedShow Answer

What factors lead to the Viaont landslide disaster?

Correct AnswerverifiedShow Answer

Joints in the landscape:

Correct AnswerverifiedShow Answer

Which of the following might indicate that slopes adjacent to this landslide might fail?

Correct AnswerverifiedShow Answer

The layer of quartzite in this photograph would mostly weather by:

Correct AnswerverifiedShow Answer

Which of the following does NOT physically loosen rocks on the surface?

Correct AnswerverifiedA

The landslide that destroyed La Conchita,as shown in this photograph,is probably:

Correct AnswerverifiedShow Answer

As illustrated in this figure,which of the following is NOT potential trigger for slope failure?

Correct AnswerverifiedShow Answer

Which of the following is valid for how rocks weather?

Correct AnswerverifiedShow Answer

Which of the following is an expression of the angle of repose?

Correct AnswerverifiedShow Answer

Which of the following factors caused some high peaks of the Cascade Mountains of the Pacific Northwest to have high potential for slope failure?

Correct AnswerverifiedShow Answer

Which of the following slope failures is most likely to cause large numbers of casualties?

Correct AnswerverifiedShow Answer

Why does weathering of granite bedrock produce rounded shapes?

Correct AnswerverifiedShow Answer

Which of the following is probably NOT important in assessing an area's potential for slope failure?

Correct AnswerverifiedShow Answer

Which of the numbered soil horizons is most likely to have clay or calcium carbonate?

Correct AnswerverifiedD

How does material in soil move?

Correct AnswerverifiedShow Answer

Which of the following slope failures is least likely to cause casualties?

Correct AnswerverifiedShow Answer

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A

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D

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