Erosion and Mass Movement

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Presentation transcript:

Erosion and Mass Movement Landslide in Tennessee http://www.youtube.com/watch?v=39LCzBS8yOM 6 minutes

Erosion The process by which the products of weathering are transported. Ex. Wind, gravity, glaciers, ocean waves and currents, streams http://www.canadiangeographic.ca/atlas/Images/Glossary/Erosion.jpg

Mass Movement The movement of rock fragments down an incline as a result of gravity. Talus: a pile of rocks that accumulate at the base of a slope. There are four types of mass movements http://www.google.com/imgres?imgurl=http://www.uoguelph.ca/~earnaud/images/talus.jpg&imgrefurl=http://www.uoguelph.ca/~earnaud/photos/talus.htm&usg=__5xgveipVISZy8vOgsgeL7EPT6Pk=&h=1050&w=720&sz=622&hl=en&start=0&zoom=1&tbnid=RffOSPpwm1PrnM:&tbnh=169&tbnw=165&prev=/images%3Fq%3Dtalus%26um%3D1%26hl%3Den%26sa%3DN%26biw%3D1280%26bih%3D685%26tbs%3Disch:1&um=1&itbs=1&iact=hc&vpx=1053&vpy=271&dur=1307&hovh=271&hovw=186&tx=142&ty=130&ei=9yupTNCPI8OAlAfg_fS3DA&oei=9yupTNCPI8OAlAfg_fS3DA&esq=1&page=1&ndsp=15&ved=1t:429,r:9,s:0

Landslide Sudden movement of loose rock and soil down a slope of a hill, mountain or cliff. Caused by heavy rainfall, spring thaws, volcanic eruptions and earthquakes. An avalanche is a type of landslide. http://www.shropshire.gov.uk/res.nsf/18116B06D01C2BEE802576FE0057C177/$file/350x220-NWRR-cars-cartoon.JPG

Creep Slow, downhill movement of rock and soil; it will cause fixed objects such as trees, fence posts, light poles in soil to lean downhill. Usually goes unnoticed until objects begin to lean. Caused by excess water in the soil, plant roots, burrowing animals, and alternating freezing/thawing.

Slump A mass of loosened rock and soil moves downhill in one large chunk. Caused by excess water in the soil which causes a loss of friction allowing rock to slip downhill. http://www.accountability-central.com/fileadmin/_temp_/School_20Bus_20-_20Cartoon_207.gif

Mudflow Clay and silt saturated with water flow rapidly downhill. Caused by heavy rain. Usually occurs in dry, mountainous regions during sudden heavy rainfall. Very dangerous….can wash out roads and destroy buildings.

Stabilization In mountainous areas where mass movement is potentially possible steps are needed to prevent death and damage to property. Methods include Concrete retaining walls/ retaining bolts Drainage pipes to reroute water Grading the slope Explosives

True or False The process by which the products of weathering are transported is called erosion. The movement of rock fragments down an incline as a result of an earthquake is mass movement. Landslide is the sudden movement of loose rock and soil down a slope of a hill, mountain or cliff.