Ch. 15 – Flashcards
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Which of the following has the lowest potential for landslides?
Pacific Northwest
southern California
bluffs along rivers in the central U.S.
Florida
Appalachian Mountains
answer
Florida
question
What type of slope failure is shown in this figure?
creep
debris flow
rock fall
rock slide
rotational slide
answer
debris flow
question
Which of the following does NOT physically loosen rocks on the surface?
water contracting as it freezes
crystals of salt and other minerals that exert an outward force on fractures
roots that pry apart fractures as the root grows in size
joints that form when rock pressures are released
rodents and other burrowing organisms
answer
water contracting as it freezes
question
Some rocks and minerals are not stable at the surface because they:
are exposed to water
formed in high-temperature environments
formed in high-pressure environments
are exposed to oxygen
all of the above
answer
all of the above
question
Where does the quartz in granite typically end up?
as small clay minerals that are deposited in lakes and the sea
quartz does not weather and so it keeps the granite from weathering
it ends up as sand in rivers, dunes, and beaches
it is converted into feldspar and weathers into clays
answer
it ends up as sand in rivers, dunes, and beaches
question
How does the character of a rock influence weathering
fractures and other discontinuities block the entry of water into a rock and so make the rock more resistant to weathering
minerals that are soluble can be dissolved and deposited and so are resistant to weathering
rocks that are broken have more surface area and so weather faster
rocks that are easily weathered and eroded generally form steep cliffs
none of the above
answer
rocks that are broken have more surface area and so weather faster
question
Which of the following factors does NOT control the stability of a slope?
the angle of repose for intact bedrock
whether the slope is rock or soil
the amount of water in the soil
the orientation of fractures, cleavage, and bedding
answer
the angle of repose for intact bedrock
question
Which of the following factors is typically NOT used to classify slope failures?
whether the material involved is rock or is unconsolidated
the rate of movement
the climate in which the failure occurs
the mechanism by which material moves
answer
the climate in which the failure occurs
question
Which of the following factors favors movement of a rock slide?
layers that are inclined opposite to the slope of the hill
solid rock with few preexisting joints or faults
a massive rock with no bedding or other through-going discontinuities
a valley or other open space downslope from the rock slide
all of the above
answer
a valley or other open space downslope from the rock slide
question
Which of the following slope failures is least likely to cause casualties?
rock avalanche
debris flow
creep
rock slide
rock fall
answer
creep