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Chapter 9 - Mass Wasting
Midterm Number II
25
Geology
Undergraduate 1
10/19/2009

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Term
mass wasting
Definition
movement in which bedrock, rock debris, or soil moves downslope in bulk, or as a mass, because of the pull of gravity.
Term
landslides
Definition
very rapid descent of rock or soil
Term
soil
Definition
any unconsolidated or weakly consolidated material at the earth's surface, regardless of particle size or composition
Term
debris
Definition
coarse grained fragments predominate in the soil
Term
earth
Definition
material that is predominately fine grained
Term
mud
Definition
high content of water, clay, and silt
Term
flow
Definition
descending mass is moving downslope as a viscous fluid
Term
slide
Definition

the descending mass remains relatively intact, moving along one or more well defined surfaces.

 

Term
rotational slide
Definition

material moves along a curved surface

upper part moves downward while the lower part moves outward

Term
translational slide
Definition

material moves along a planar surface

moves along a plan approximately parallel to the slop of the surface

Term
fall
Definition

occurs when material free falls or bounces down a cliff

 

Term
relief
Definition
vertical distance between valley floor and mountain summit
Term
shear force
Definition

parallel to the slope and indicates the block's ability to move.

component of gravitational force parallel to slope in downslope direction; if shear force is greater than shear resistance due to friction, downslope movement will occur.

Term
shear strength
Definition

the resistance to movement or deformation of that soil

resistant to downslope movement through friction between soil particles

Term
creep
Definition
very slow, downslope movement of soil, due mostly to freeze/thaw cycles
Term
earthflow
Definition
earth moves downslope as a viscous fluid, can be slow or rapid
Term
solifluction
Definition
flow of water saturated soil over impermeable material (permafrost)
Term
permafrost
Definition
ground that remains frozen for many years
Term
debris flow
Definition
flow involving soil in which coarse material is predominant
Term
mudflow
Definition
a flowing mixture of soil and water, usually moving down a channel
Term
debris avalanche
Definition
a very rapidly moving turbulent mass of debris, air, and water
Term
rockfall
Definition
coherant blocks of bedrock falling or sliding downslope.
Term
talus
Definition
apron of fallen rock fragments that accumulates at the base of a cliff
Term
rockslide
Definition
the rapid sliding of a mass of bedrock along an inclined surface of weakness, such as a bedding plane, a major fracture in rock, or a foliation plane.
Term
factors that enhance mass wasting
Definition

undercuting

vegetation removal

mass redistribution

role of water

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