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Weathering The process of breaking down of rocks into smaller and smaller pieces of rock. These small pieces are known as sediment. Sediment breaks down further and becomes soil. 180px-GeologicalExfoliationOfGraniteRock YehliuTaiwan-HoneycombWeathering Types of Mechanical Weathering Ice Wedging- Water in the cracks of rocks freeze Abrasion- Particles of sand are carried by the wind and water Plant Action – roots from plants grow in the cracks of rocks Release pressure – when pressure is removed from rocks Erosion Erosion takes rocks and other particles 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 Gravity/Mass Movement Erosion Gravity is the force behind Water 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 slips and moves down a slope. A slump occurs when the slope becomes too 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 is occurring Deposition Process by which sediments, soil and rocks are added to a landform or land mass (the end of erosion). http://education.usgs.gov/lessons/schoolyard/RockSedimentary.html What is a watershed? It is the area of land and waterways that drain to a water body. Water Pollution There are two types of water pollution, point source and non-point source. •Point source pollution is pollution that is directly put in to the water. •Non – point source is pollution that happens somewhere else and then runs into the water.