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ch. 9-new test
Terms in this set (29)
One way to prevent slope failure is to __.
all the answers are correct
When a stream, wave action, or excavation by humans undercuts the base of a slope, slope failure may occur because __.
downslope support of the slope materials will have been reduced or eliminated
In a translational slide, the descending mass __.
moves along a plane approximately parallel to the slope of the surface
In areas where the daily temperature regularly varies above and below the freezing temperature of water, the freeze-thaw cycle __.
all the choices are correct
Assuming that all other conditions are identical, a slope that is ___ is more stable.
more gently inclined
If, over a period of time, your home develops doors that stick, cracked walls, broken pipes, and cracked driveways, ____ may be occurring.
A(n) _____ is a general term that tells nothing about the processes involved.
______ is ground that remains frozen for many years.
Heavy irrigation on a hillslope will cause __.
all of the answers are correct
The rate of movement in creep is usually __.
a centimeter or less per year
Resistance to movement or deformation of soil is called __.
A rock avalanche begins its downslope journey __.
Which of the following factors are how geologists, engineers, and others classifying mass wasting?
rate of movement, type of material, type of movement
Mudflows are ___ likely to occur in arid regions than in wet climates
A(n) apron of fallen rock fragments called ___ is generally found at the base of a slope affected by rockfall.
In ____, soil in which fine grains predominate moves downslope as a viscous fluid.
A _____ involves movement along a curved surface.
Mudflows are ___ likely to occur in areas not protected by vegetation.
Mudflows generally contain __.
primarily mud-sized particles with some water, but may also contain particles as large as boulders
Two factors that contribute significantly to soil creep are water in the soil and ___.
freeze thaw cycles
____ generally makes a slope more susceptible to mass wasting of soil.
A(n) _____ is the rapid sliding of a mass of bedrock along an inclined surface of weakness.
If movement becomes very rapid, a rockslide may break up and become __.
a rock avalanche
_____ commonly trigger mass wasting events.
When soil is saturated with water ____ increases.
Shear strength __.
is the total force/stress resisting movement
Slide is a term that means that the descending mass __.
List the following flow terms in the order of decreasing velocity (fastest first): mudflow, debris avalanche, creep, and earthflow.
debris avalanche, mudflow, earthflow, creep
Among techniques used to prevent rockfalls along highways is to _____.
all of the choices are correct
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