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Glossary of Mass Wasting

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flow
mass moves downslope as a viscous fluid.
slip
mass remains stuck together, moving on a defined surface
slump
movement along a curved surface
slide
descending mass that moves along a plane parallel to the slope of the surface
normal force
force of gravity perpendicular to the slope
shear force
force of gravity parallel to the slop
Shear strength
resistance to deformation due to cohesiveness, friction, plant roots
Creep
slow, continuos, downslope movement of soil or debris and loose debris`
Debris Flow
the general term used for mass wasting where motion takes place throughout the mass
Earth flow
when debris moves downslope as a viscous fluid and is covered by a blanket of vegitation
solifluction
flow of water-saturated debris over impermeable material
Permafrost
ground that remains frozen for many years
mudflow
mixture of debris and water, down a channel
Debris avalanche (landslide)
fastest type of debris flow that has air trapped under the rock mass that may act as an air cushion that reduces friction
Rockfall
when a block of bedrock breaks off and falls freely or bounces down a cliff
Talus
an apron of fallen rock fragments that accumulates at the base of a cliff
rockslide
rapid sliding of a mass of bedrock alon an inclined surface
Debris slide
a coherent mass of debris moving along a surface
Debris fall
a free-falling mass of debris that initially started out as a coherent mass.

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