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the wearing down of rock particles by friction due to water or wind or ice


(geology) the erosion of soil as a consequence of sand and dust and loose rocks being removed by the wind


hills of sand pushed up by winds


a fine-grained unstratified accumulation of clay and silt deposited by the wind


a slowly moving mass of ice

Glacial Drift

the rock material carried and deposited by glaciers

Alpine Glacier

a glacier that moves down from a high valley


bowl-shaped basins eroded by valley glaciers


a sharp narrow ridge found in rugged mountains

Continental Glaciers

smoothe the landscapes by removin the features that existed before the ice appeared


isolated boulders left behind by a glacier

Ice Age

any period of time during which glaciers covered a large part of the earth's surface

Mass Movement

the downhill movement of rock and soil because of gravity


a slow creeping mode of locomotion (on hands and knees or dragging the body)


Type of mass movement that involves the detachment and movement of a small block of rock from a cliff face to its base. Normally occurs when the rock has well defined bedding planes that are exaggerated by freeze-thaw action or thermal expansion and contraction.


a slide of a large mass of dirt and rock down a mountain or cliff


quickly moving downhill flow of soil and rock fragments containing a large amount of water

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