Shared Flashcard Set

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Earth Science
Chapter 4
15
Science
Not Applicable
11/03/2005

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Cards

Term
mass wasting
Definition
the downslope movement of rock and soil
under the influence of gravity
Term
what triggers mass wasting?
Definition
saturation of material with water
oversteepening of slopes
removal of anchoring vegetation
ground vibrations from earthquakes
Term
angle of repose
Definition
steepest angle at which materical remains stable
Term
what are some types of motion in mass wasting?
Definition
fall
slide
flow
Term
fall
Definition
freefall of detached individual pieces of any size
steep slopes, freeze/thaw, roots
Term
slides
Definition
occur whenever material remains fairly coherent and moves along a well-defined surface
slump
Term
flow
Definition
occurs when material moves downslope as a viscous fluid
Term
slump
Definition
downward sliding of a mass of rock or unconsolidated material moving as a unit along a curved surface
Term
debris flow
Definition
involves flow of soil and regolith containing a large amount of water
rapid
mudflow
Term
earthflow
Definition
downslope movement of water-saturated, clay-rich sediment
humid regions
Term
creep
Definition
involves gradual downhill movement of soil and regolith
Term
what is the controlling force of mass wasting?
Definition
gravity
Term
what are the criteria used to classify mass-wasting processes?
Definition
type of material
kind of motion
velocity of movement
Term
lahar
Definition
volcanic material debris flows on the flanks of volcanoes
Term
mechanisms/factors that contribute to creep
Definition
freezing, thawing, wetting, drying
rain, roots, animals
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