Reading Assessment Chapter 7 GEOL105

25 July 2022
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question
Which of the following is the slowest mass wasting process?
answer
Creep
question
Does adding vegetation to a slope make it more or less stable?
answer
It depends on the slope, adding vegetation could make the slope either more or less stable.
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How do drains help to prevent landslides?
answer
Drains divert water away from the slope.
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If you see a steep cliff with piles of rocks at the bottom, what kind of mass wasting has occurred?
answer
Fall
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Which of the following natural disasters is linked in some way with landslides?
answer
Earthquakes, floods, volcanoes, and tsunamis all have some connection with landslides.
question
Which of the following is NOT an important factor in the stability of a slope?
answer
Direction of Sun exposure
question
Would adding mass to the top of a slope in the form of houses or buildings make the mass more or less likely to slide?
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It would make it more likely to slide because the houses add weight to the slope making it more unstable.
question
Which of the following is NOT a factor in how urbanization increases the incidence of landslides?
answer
Flood control measures prevent river flooding, which increases the incidence of landslides.
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Which of the following is the most rapid form of mass wasting?
answer
Rock fall
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Which of the following describes a slump?
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Blocks of rock break off and move together, sliding along a curved path.
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Which of the following is NOT a way in which water contributes to slope failure?
answer
Water adds cohesion between the grains of the soil causing it to become unstable.
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Which of the following is the most important driving force in landslide?
answer
Weight of the slope in the downslope direction
question
Which area of the U.S. has a highest incidence of landslide activity?
answer
Appalachian Mountains
question
Which of the following statements is FALSE about snow avalanches?
answer
Snow avalanches are very rare and seldom cause death.
question
Which of the following human activities can DECREASE the incidence of mass wasting?
answer
Improving drainage from the slope
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People can stabilize a slope through increased drainage and slope supports.
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True
question
Building homes on a slope can increase the mass on the slope and the potential for landslides.
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True
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Volcanic eruptions are the one example of a natural hazard that cannot produce landslides.
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False
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Constructing roads on slopes decreases the incidence of landslides because asphalt generally does not let water soak into the ground.
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False
question
Landslides are an example of a geologic hazard in which damage can be greatly reduced if appropriate measures are taken in the area of public policy and landslide control.
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True
question
What is "grading" as it pertains to the stability of a slope?
answer
Human-induced changes in the slope angle to make it more or less steep
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Which of the following is NOT a term for a segment type on a slope?
answer
Elliptical
question
In which location would you expect to have the most landslides at the END of the given sequence of events? For all areas, assume that each event (drought, wildfire and heavy rain) is identical.
answer
Location in the mountains that first experiences a long drought, then experiences wildfires, and then experiences heavy rain
question
Which of the following involves downslope movement of a coherent, usually large block of earth material along a planar surface?
answer
Rock slide
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In buying a house, why should you be wary of tilted telephone poles?
answer
It is a sign of creep.
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Which of the following is NOT a normal purpose of a landslide hazard map of an area?
answer
Individuals could use it to decide where their family should meet after a landslide disaster.
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Which of the following is FALSE about the effects of landslides?
answer
Landslides, because of the damage they normally inflict, offer no natural service functions.
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In which location would you expect to have the most landslides? For each area, assume the total amount of rain per year is identical.
answer
Mountains with heavy rainstorms followed by long dry periods
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All non-horizontal slopes have potential for mass wasting of some type.
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true
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One indication of a rock fall is an accumulation of rocks at the base of a cliff.
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true
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Growing plants on a slope will always make it more stable because plant roots add strength and cohesion to the soil.
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False
question
Only one mass wasting type happens at a single time to an individual slope.
answer
false
question
If you see a gently sloping hillside with tilting utility poles, broken retaining walls, and trees with curved tree trunks, what type of mass wasting has probably occurred?
answer
Creep
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What is mass wasting?
answer
Downslope movement of rock, soil, and sediment
question
Which of the following is NOT a sign of a potential landslide?
answer
Vegetated slope that has not received rain in two weeks
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Adding earth material to the lower part of a slope which has the potential for a landslide would
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increase the resisting force
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Landslides can be a positive event for forests by creating new habitats for plants and animals.
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True
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Landslides are a significant hazard on the California coastline and in the Rocky Mountain states.
answer
True
question
If you see a concrete wall with several drain holes through it on the side of a roadway, what is its purpose?
answer
Support the base of the slope.
question
Which of the following mass wasting processes does NOT necessarily involve water?
answer
Rock fall
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How is the incidence of landslides expected to change in the future?
answer
Incidences of landslides will increase.
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In purchasing a house, some steps can be taken to determine whether it is susceptible to a landslide hazard.
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True
question
A slope with sedimentary layering parallel to the ground surface is more stable than a slope with sedimentary layering perpendicular to the ground surface.
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False
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The type of mass wasting process that occurs depends on many different factors including the steepness of the slope and the type of material involved.
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true
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Which of the following environments is NOT susceptible to mass wasting?
answer
Relatively flat-lying area
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Slopes that have been cleared of native grasses and other vegetation become more stable.
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False
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The climate surrounding a slope has very little impact on whether the slope will fail.
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False
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The term Avalanche only applies to the movement of snow down slopes.
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False
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The Portuguese Bend landslide in California involved
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radual, continuous, downslope movement over a 30 year time period that resulted in damage to many homes.
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The U.S. Midwest has relatively low risk for landslides mainly because the soils are extremely compacted and therefore strong.
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False
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Slumps are the only form of mass wasting that are not triggered by excess water.
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True
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Most snow avalanches are triggered by the victims themselves or by someone in their company.
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True
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The Portuguese Bend landslide in California involved an area with weak sedimentary rock that has bedding parallel to the slope and a cliff at the front edge where ocean waves eroded into the cliff.
answer
True
question
Placing a greater weight on the top of a slope can cause mass wasting to occur.
answer
True