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Chapter 8 practice test
Questions and answers from the practice test
53
Geology
Undergraduate 3
11/23/2011

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Term
Mass wasting is the(Blank, Blank) movement of earth material such as regolith or solid rock under the influence of gravity
Definition
Down Slope
Term
What is Regolith?
Definition
Regolith is all of the materials lying between unweathered bedrock below and the earth's surface above
Term
Gravity, a force, can be represented by a vector. A vector has both (Blank)and (Blank)
Definition
magnitude, direction
Term
Gravity acting across a sloped or inclined surface can be broken into a (Blank) and a (Blank) component.
Definition
Normal, Tangential
Term
A landslide is defined as the downward and outward movement of slope-forming materials. True or false
Definition
True
Term
Landslides are classified on the basis of the type of material that existed prior to the landslide and the type of movement that dominates during the landslide. Select from the following list of material that might exist prior to a landslide.
a) rock
b) Soil
c) earth
d) Mud
e) Debris
Definition
a-e(all materials listed)
Term
Select from the following list the type of movement that might occur during a landslide.
a) falling
b) Sliding
c) Spreading
d) Flowing
e) Running
Definition
a-d are the common types of movement associated with landslides
Term
Rock is defined as any (blank), (blank), and firm mass that existed in it natural place prior to a landslide
Definition
intact, hard
Term
Soil is an aggregate of (Blank) and (blank) +/- organic material that formed from the in situ weathering of rock or sediment
Definition
minerals, rock fragments
Term
What might fill the voids and spaces between mineral or rock fragments in a soil?
Definition
gas and water
Term
Material defined as earth is composed of:
a) 80% or more particles smaller than 0.06 mm
b) 20% to 80% oarticles larger than 2 mm
c) 80% or more particles smaller than 2 mm
Definition
c) 80% or more particles smaller than 2 mm
Term
Material defined as mud is composed of:
a) 80% or more particles smaller than 0.06 mm
b) 20% to 80% particles larger than 2 mm
c) 80% or more particles smaller than 2 mm
Definition
a) 80% or more particles smaller than 0.06 mm
Term
Material defined as debris is composed of:
a) 80% or more particles smaller than 0.06
b) 20% to 80% particles larger than 2 mm
c) 80% or more particles smaller than 2mm
Definition
b) 20% to 80% particles larger than 2 mm
Term
A complex landslide commonly involves two or more of the classes, (blank), (blank), (blank), or (blank)
Definition
fall, slide, spread, flow
Term
What are rock falls?
Definition
The term rock falls represents both a process and the resulting deposit. The process inolves the falling for some distance through the air, or the bouncing and rolling down slope of solid material or soil on a steep slope. The typically broken and shattered material resulting from this process is also called a rock fall
Term
What are topples?
Definition
A topple is a rock fall that involved the forward rotation of a detached block above a pivotal point located in the lower part of the detached material. When the block detached from the substrate it appears to pitch and rotate forward.
Term
What is the common term that is synonymous with slide?
Definition
slump
Term
A slide forms when a coherent mass of regolith or bedrock breaks free and then slides down slope along either a (blank), or (blank) surface
Definition
planar, curved
Term
What are the two major types of landslides that fall under the heading of slide?
Definition
translational and rotational
Term
Is the surface of failure for a translational slide planar or curved??
Definition
Planar
Term
Is the surface of failure for a rotational slide planar or curved?
Definition
Curved
Term
How does a translational slide differ fro m a block slide?
Definition
A block slide is a special type of translational slide. It involved material that is hard and intact enough to slide down slope as a relatively coherent mass.
Term
Liquefaction is the process by which water saturated, loose, cohesion less sediments are transformed from a (blank) into a (blank) state
Definition
soild, liquid-like
Term
On what type of slope would a lateral spread likely occur on: Gentle or steep?
Definition
Gentle
Term
Failure during a lateral spread is caused by what?
Definition
Liquefaction, which typically occurs as a result of ground shaking during an earthquake
Term
Water saturated fine grained slope material that liquefies and then runs out, leaving a bowl-shaped depression on the sloping land surface are called (blank)
Definition
Earthflow
Term
Are earth flows generally faster or slower than mudflows?
Definition
Slower
Term
Material in an earthflow is composed of
a) 80% or more particles smaller than 0.06 mm
b) 20% to 80% particles larger than 2 mm
c) 80% or more particles smaller than 2 mm
Definition
c) 80% or more particles smaller than 2mm
Term
how would you describe the outline of the source area, main track, and site of deposition of an earth flow if you could view it in an airplane?
Definition
As an hour glass
Term
Given a steep sloped terrain with a mantle of loose coarse debris, what might happen following an intense torrential rainfall or the melting of large amounts of snow and ice during a spring thaw?
Definition
A debris flow may form
Term
A debris flow is commonly described as having the consistency of what common mixture?
Definition
Wet Cement
Term
Material in a debris flow is composed of:
a) 80% or more particles smaller than 0.06 mm
b) 20% to 80% particles larger than 2mm
c) 80% or more particles smaller than 2 mm
Definition
b) 20% to 80% particles larger than 2 mm
Term
Debris flows can reach speeds of
a) 26 km/hours
b) 36 km/hour
c) 50 km/hour
d) 56 km/hour
e) 66km/hour
Definition
d) 56 km/hour
Term
Can debris flows carry particles as large as a house?
Definition
Yes
Term
A mud flow differs from a debris flow in what way?
Definition
It is composed of finer grained material. For example, a mudflow is composed of 80% or more particles less than 0.06 in size, while a debris flow is composed of 20% to 80% particles larger than 2 mm in size
Term
The imperceptible slow and steady down slope of movement of the regolith is called (blank)
Definition
creep
Term
List at least 4 line of evidence for creep
Definition
bent trees, roads, railroad tracks, retaining walls, the down slope tilting of layered rocks
Term
Permafrost is soil that must remain frozen for at least (blank) consecutive years
Definition
2
Term
What happens to the topmost or surface portion of permafrost during the summer?
Definition
it melts
Term
The slow imperceptible down slope motion of the topmost or surface portion of permafrost is called (blank)
Definition
Solifluction
Term
What common type ofrock underlies Mount Soledad in La Jolla, California?
a) Gneiss
b) Granite
c) Shale
d) Conglomerate
e) Rhyolit
Definition
c) Shale
Term
Have geologists mapped ancient landslides in the Mount Soledad Region?
Definition
Yes, Many
Term
A Major Right-Lateral strike-slip fault system transects the Mount Soledad region and is called the:
a) San Andreas Fault System
b) San Jacinto fault SYstem
c) Rose Canyon-Country Club fault system
d) Elsinore fault system
e) Garlock Fault system
Definition
c) Rose Canyon-Country club fault system
Term
Is there recent historical evidence of landslide activity in the Mount Soledad area?
Definition
yes, several have occured since 1961
Term
On October 3rd 2007, a large mass of the slope lying between Soledad Mountain
Road and Desert View Drive, La Jolla, California detached and began sliding down
slope.  Given your answers to questions 50 through 53, should the residents of
this area have been surprised?  If not, then why not?
Definition
No, the Mount Soledad area is well known for its susceptibility to landslides
Term
Between March 4, 1995 and january 10, 2005 two landslides occured at La Conchita, califonia. How is the 1995 Landslide classified?
Definition
A Complex-Slump earth flow
Term
Was anyone killed during the March 4, 1995 landslide?
Definition
No
Term
During January 10, 2005 landslide was new material involved or did the January 10 landslide simply reactive portions of the older slide?
Definition
the SE portion of the old landslide material was reactivated
Term
How was the january 10, 2005 landslide at La Conchita classified?
Definition
Debris Flow
Term
How many people were killed by the January 10 landslide?
Definition
10 people
Term
How would you describe the weather conditions that preceded the January 10, 2005 and March 4, 1995 landslides at La Conchita
Definition
Intense long periods of rainfall preceded both landslides
Term
As it turns out, the January 10, 2005 and March 4, 1995 landslides at La Conchita are only small parts of a much larger ancient landslide. What is the name of this larger and more ancient feature?
Definition
The Rincon Mountain landslide
Term
Do you consider La Conchita a safe place to live? If not, then why not?
Definition
La Conchita is not a safe place to live. As noted by Larry Gurrola, other landslides are highly likely especially following intense long periods of rainfall.
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