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Cards In This Set
| Front | Back |
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Which one of the following
aquifers would be best for purifying groundwater that is contaminated with
harmful sewage bacteria?
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a. clay
b. coarse gravel
c. sand
d. cavernous limestone
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Which of the following
rock materials would be least permeable?
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a. coarse sand
b. clay-rich, fine‑grained sand
c. gravel
d. cavernous limestone
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The major cause of most low‑latitude
dry climates is:
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a. their positions in the deep interiors
of continents
b. the presence of high mountains that
separate these areas from moist
maritime air masses
c. zones of high atmospheric pressure
and dry descending air
d. none of the above
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An open ocean wave has a
wavelength of 20 meters, a wave height of 4 meters,
and a period of 6
seconds. At what depth will this
wave begin to "feel
bottom"?
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a. 1 meter
b. 2 meters
c. 10 meters
d. 15 meters
e. impossible to
determine from the information given
because the wave moves half of the wavelength below the surface. therefore that is where the wave would begin to feel the ground. |
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A steep‑sided
amphitheater‑shaped bowl, excavated by frost action
and glacial erosion, at the head of a
glacial valley is called
a(n)
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a. horn
b. arete
c. cirque
d. fjord
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The dominant erosional
force on Mercury is:
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a. meteorite
cratering
b. heat expansion
c. solar radiation
d. moonquakes
|
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Which of the following is
NOT found on Venus
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a. prominent plateaus
and basins
b. volcanoes
c. two-step
topography
d. atmosphere
|
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At a bend in a river,
the main point of deposition is:
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a. on the outside of the
bend
b. on the inside of
the bend
c. both outside and
inside the bend
d. in the center of the
channel
|
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The downhill tilting of
fences and telephone poles, and the presence of trees with curved trunks
(convex downslope) are indications of what geologic process?
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a. Debris avalanche
b. Slump
c. Soil creep
d. Gliding
e. Mudflow
|
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Which of the following
types of mass wasting is generally the slowest?
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a. mudflow
b. creep
c. slump
d. they are all about the same
|
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Mass wasting events are caused by
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1) Over-steepening of slope,
2) Too much water, and
3) Unusual rock/soil conditions.
|
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Ways to mitigate mass wasting dangers?
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-Steep slopes can be covered or
sprayed with concrete covered with a wire mesh to prevent rock falls.
-Retaining
walls could be built to stabilize a slope.
-If
the slope is made of highly fractured rock, rock bolts may be emplaced to hold the slope together and prevent
failure.
-Drainage
pipes could be inserted into the slope to more easily allow water to get out
and avoid increases in fluid pressure, the possibility of liquefaction, or
increased weight due to the addition of water.
-Oversteepened
slopes could be graded to reduce the slope to the natural angle of repose.
-In
mountain valleys subject to mudflows, plans could be made to rapidly lower
levels of water in human-made reservoirs to catch and trap the mudflows.
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Slump
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A form of mass wasting
event that occurs when loosely consolidated materials or rock layers move a
short distance down a slope.
|
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Slide
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Rocks moving rapidly along
a surface parallel to slope.
|
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Flow
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Material moves as fluid.
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