Question 1

What type of slope failure is shown in this figure?

Accepted Answer

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

Question 2

Which of the following generally is true about caves formed by dissolution?

Accepted Answer

A)   acidic waters dissolve feldspar in granite, producing clay
B)   groundwater removed material from limestone
C)   hot geothermal waters introduce acids into shallow rocks
D)   carbon dioxide rises from depth and dissolves calcite and clayE) C) and D)
F) B) and C)

Question 3

Aside from limestone, which other kinds of rock types produce karst terrain?

Accepted Answer

A)   evaporite rocks such as salt and gypsum
B)   granite
C)   sandstone
D)   shaleE) C) and D)
F) None of the above

Question 4

What is the main process by which soils form?

Accepted Answer

A)   deposition of silt on a floodplain
B)   deposition of silt by the wind
C)   weathering
D)   erosionE) A) and B)
F) A) and D)

Question 5

People reshape steep slopes, a practice called terracing, in order to:

Accepted Answer

A)   help capture and retain rainfall
B)   provide a level place on which to farm
C)   promote soil formation
D)   protect soil from erosion
E)   all of theseF) None of the above
G) B) and E)

Question 6

Which of the following is the main hazard for areas along the river terrace?

Accepted Answer

A)   shrinking and swelling of clays
B)   slow movement of material downslope
C)   rock falls
D)   debris flows that carry large blocks from the volcanoE) A) and D)
F) A) and C)

Question 7

Which of the following has the lowest potential for landslides?

Accepted Answer

A)   Pacific Northwest
B)   southern California
C)   bluffs along rivers in the central U.S.
D)   Florida
E)   Appalachian MountainsF) C) and D)
G) A) and E)

Question 8

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) B) and C)
F) A) and D)

Question 9

What concepts can be explained using this diagram?

Accepted Answer

A)   the movement of water between the oceans and the land
B)   how precipitation ends up in rivers or groundwater
C)   how weathering causes the seas to become saltier
D)   all of theseE) B) and D)
F) A) and B)

Question 10

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) C) and D)
F) A) and D)

Question 11

Which of the following factors does NOT control the stability of a slope?

Accepted Answer

A)   the angle of repose for intact bedrock
B)   whether the slope is rock or soil
C)   the amount of water in the soil
D)   the orientation of fractures, cleavage, and beddingE) B) and C)
F) All of the above

Question 12

What is the main force involved in the stability of slopes?

Accepted Answer

A)   water pressure
B)   sunlight
C)   wind
D)   gravity
E)   radioactivity decayF) A) and E)
G) A) and D)

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) None of the above
F) A) and C)

Question 14

Which of the following is NOT a common trigger for slope failure?

Accepted Answer

A)   adding water to a slope
B)   volcanic eruption
C)   shaking during an earthquake
D)   oversteepening of cliffs or hillslopes during road construction
E)   all of these are common triggers for slope failureF) All of the above
G) B) and D)

Question 15

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) A) and B)
G) A) and E)

Question 16

What type of slope failure is shown in this figure?

Accepted Answer

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

Question 17

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) A) and B)
G) A) and C)

Question 18

Which of the following is true about how weathering affects fractured rocks?

Accepted Answer

A)   Weathering affects rocks from the outside in, forming an outer weathered zone or rind.
B)   Weathering attacks corners from three sides and so these are preferentially removed.
C)   Preferential weathering along fractures can cause blocks to become rounded.
D)   D. All of these.E) A) and C)
F) B) and D)

Question 19

What happens when rocks oxidize near Earth's surface?

Accepted Answer

A)   minerals in the rock release oxygen that can break down adjacent rocks
B)   oxygen combines with water to create weak acids that weather rocks
C)   minerals, especially those with iron, combine with oxygen
D)   oxygen combines with silica to make quartzE) B) and D)
F) B) and C)

Question 20

Which of the following are problems related to soil?

Accepted Answer

A)   individual grains lose contact with one another as water squeezes between them
B)   certain clay minerals increase in volume when they become wet
C)   soils that do not compact uniformly because of varying amounts of clay
D)   erosion due to loss of plant cover, such as from overgrazing
E)   all of theseF) A) and E)
G) B) and E)

Exam 15: Weathering, Soil, and Unstable Slopes

What concepts can be explained using this diagram?

Correct AnswerverifiedShow Answer

What happens when rocks oxidize near Earth's surface?

Correct AnswerverifiedShow Answer

Which of the following are problems related to soil?

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Which of the following is NOT a common trigger for slope failure?

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Which of the following is true about how weathering affects fractured rocks?

Correct AnswerverifiedShow Answer

Which of the following factors does NOT control the stability of a slope?

Correct AnswerverifiedShow Answer

Aside from limestone, which other kinds of rock types produce karst terrain?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

What type of slope failure is shown in this figure?

Correct AnswerverifiedShow Answer

Which of the following is the main hazard for areas along the river terrace?

Correct AnswerverifiedShow Answer

The type of slope failure shown in this photograph is:

Correct AnswerverifiedShow Answer

Which of the following generally is true about caves formed by dissolution?

Correct AnswerverifiedShow Answer

What is the main process by which soils form?

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 has the lowest potential for landslides?

Correct AnswerverifiedShow Answer

People reshape steep slopes, a practice called terracing, in order to:

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

What is the main force involved in the stability of slopes?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

What type of slope failure is shown in this figure?

Correct AnswerverifiedShow Answer

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