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GEO 101 Ch. 12
Terms in this set (39)
What are the major energy sources?
What are hydrocarbons?
How are oil and gas formed?
How is coal formed?
How can we obtain nuclear energy?
What are drawbacks of nuclear energy?
What is the future of the oil energy?
What are environmental issues of fossil fuel use?
Do we have any alternatives?
Earth is approximately ____ years old
What factors distinguish the various types of mass movement?
How does each type of mass movements differ?
Why do mass movements occur?
What factors trigger downslope movement?
How can we identify regions at risk?
How do geologists find an area susceptible to mass movements?
What steps can people take to reduce the risk of mass movements?
This mass movement takes place gradually
This mass movement is most like a liquid
This mass movement always travels down a curved surface
This mass movement includes a large proportion of ash derived from a volcanic eruption
_____is a turbulent cloud of debris (rock and/or snow) mixed with air that rushes down a steep hill slope at high velocity
____is a wedge-shaped pile of rock fragments that accumulates at the base of a cliff
The principal difference between a debris flow and a mudflow is
the grain size of the moving mass
The principal difference between a lahar and a mudflow is
that the former mass contains pyroclastic debris from a volcanic eruption
The principal difference between a debris flow and a debris slide is
that the former mass contains abundant water whereas the latter is dry
The principal difference between a slump and a debris slide is
the shape of the path taken by the moving mass
The immediate cause of incidents of mass movement is
Materials at the Earth's surface are weakened by fracturing and weathering: T/F
Gravity pulls material to a lower elevation: T/F
Fractured rock holds together by friction: T/F
Intact rock holds together by friction: T/F
Mass movements take place when the ____ force is greater than the _____ force
What can become a weak subsurface?
-Wet clay layers
-Wet, unconsolidated sand layers
-Metamorphic foliation planes
What decreases the risk of mass movement?
adding vegetation to the side of a hill
Mass movement along coastal cliffs in southern California is so common because
-the region is along an active margin with frequent earthquakes
-the region is dry and the slopes support little or no vegetation
-much of the rock in southern California is fractured
____ is not a possible cause of mass movements
____is not a way of preventing mass movements
All landslides are mass movements, but not all mass movements are landslides: T/F
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