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Erosion Erosion takes rocks and other partials from one location and puts them in another. Weathering is breaking up rocks, erosion is carrying them away. The Agents of Erosion Wind Water Glaciers Gravity / Mass Movement Wind Erosion Wind can carry sand, silt, and clay from one place and deposit it in another. This type of erosion is most frequent in dry areas with little or no vegetation. Wind Erosion http://upload.wikimedia.org/wikipedia/en/1/15/Mesquite_Sand_Dunes.JPG Water Erosion The most important agent of erosion is running water. Water runs down hill and form a gully by taking away sediment. Water continues to flow in the gully and eventually forming a valley. Water can cause erosion of the shore line can be from waves in the ocean. Water Erosion http://en.wikipedia.org/wiki/Image:Gully_ElPasoCounty_CO_USA.jpg Water Erosion http://en.wikipedia.org/wiki/Image:Wavecut_platform_southerndown_pano.jpg Glaciers Erosion Glacier Erosion is sometimes referred to as Ice Erosion Glaciers move slowly across land picking up large rocks and and even larger boulders. Glaciers can cause deep valleys to form as they move across the land. Glaciers Erosion http://en.wikipedia.org/wiki/Image:Glacier_mouth.jpg Gravity/Mass Movement Erosion Gravity is the force behind Water and Glacier Erosion Gravity alone can cause Erosion Gravity/Mass Movement Erosion http://en.wikipedia.org/wiki/Erosion#Gravity_erosion Types of Gravity/Mass Movement Erosion Slump Creep Rockfalls Rockslides Mudflows Landslides Slump A slump occurs when a mass of land slip/ move down a slope. A slump occurs when the the slope becomes to steep and the material under it can not support the ground above it. http://geology.about.com/library/bl/images/blslump.htm http://geology.about.com/library/bl/images/blslump.htm Creep Sediment slowly moves down hill. Leaning trees and fence post are clues that creeping occurring Rockfalls Occur when parts of a rock break off and tumble through the air. http://www.seismo.ethz.ch/hazard/risk/PaleoSeis/rockfalls2.htm Rockslides Large and small rock slide down a slope. http://www.grisda.org/origins/11090.htm Mudflows Happen after heavy rains. More likely to occur when there is a lack of vegetation. Gravity pulls on the heavy water saturated sediment and causes it to flow down hill. http://en.wikipedia.org/wiki/Image:Mudflow_mailboxes.jpg Landslides A movement of land down a slope. http://www.signonsandiego.com/news/state/20050601-1811-wst-lagunalandslide.html