Mass Wasting

http://www.flickr.com/photos/vikellis/2812428756/

Cliffs are also susceptible to mass movements . These can be slow or sudden .

Waves attack the cliffs at the base, undercutting them. Takes place on soft rock. Rain saturates the top of the cliff.

Rock slumps into the sea.

Takes place on harder rock, built up in layers. The top layer may become saturated.

It slides over the layer beneath- rapidly moving downhill.

Very fine loose material becomes saturated with water and just flows down a slope.

http://www.flickr.com/photos/earthwatcher/3426369280/in/set-72157616446077703 /

Freeze-thaw weathering will shatter rocks from cliffs- material will gather at the base. Talus/ Scree slope.

http://www.flickr.com/photos/ush/2839961487 /

Soil particles expand due to moisture. They are lifted at a right angle away from the slope. As they dry, they shrink, but the force of gravity pulls them vertically down. There is a slow downward movement of material over time.

http://www.flickr.com/photos/rschott/474190143/

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Mass Wasting

by TonyCassidy on Sep 23, 2009

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Mass Wasting — Presentation Transcript