moving rock weathering & erosion grade 8; gle 14
TRANSCRIPT
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Moving RockMoving Rock
Weathering & ErosionWeathering & Erosion
Grade 8; GLE 14http://www.science-class.net/Geology/weathering_erosion.htm
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WeatheringWeathering
Processes that change the Processes that change the characteristics of rocks on the characteristics of rocks on the Earth’s surface Earth’s surface
Must occur BEFORE erosion can Must occur BEFORE erosion can happenhappen
No movement is involvedNo movement is involved Occurs when rocks are exposed to Occurs when rocks are exposed to
water, air or plantswater, air or plants
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Mechanical Weathering Mechanical Weathering
BREAKS rocks into different shapes BREAKS rocks into different shapes and smaller sizesand smaller sizes
Jagged rocks usually become smoothJagged rocks usually become smooth
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AbrasionAbrasion
Breaking, grinding, Breaking, grinding, wearing away of wearing away of rockrock
Caused by wind Caused by wind and waterand water
http://richmond.k12.va.us/schools/thirteenacres/images/rockpic5.jpg
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Frost Action or Ice WedgingFrost Action or Ice Wedging
Freezing water in Freezing water in cracks expands cracks expands and breaks rocksand breaks rocks
http://www.bearmountainzoo.org/es12.jpg
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Plate MovementPlate Movement
The moving and The moving and sliding of tectonic sliding of tectonic plates wear away plates wear away rocks as they slide rocks as they slide past each otherpast each other
http://piru.alexandria.ucsb.edu/~tierney/trs0demo/trs-0_files/geosystems12-08%5B1%5D.jpg
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Exfoliation / Temperature ChangeExfoliation / Temperature Change
Warming and Warming and cooling of rock cooling of rock causes top layers causes top layers to break off in to break off in sheetssheets
http://uregina.ca/~sauchyn/geog323/279.jpg
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Close to Home – Enchanted RockClose to Home – Enchanted Rock
http://www.answers.com
http://geology.uprm.edu/Morelock/images/965ERdome.jpg
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Plants and AnimalsPlants and Animals
Wedging of roots Wedging of roots and burrowing of and burrowing of animals wears animals wears away rockaway rock
http://www.geol.lsu.edu/Faculty/Ferrell/class/ClarkCreek/weathering_img2.gif
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Close to Home – Texas Hill CountryClose to Home – Texas Hill Country
http://www.texasep.org/cpft/lugc.html
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Chemical WeatheringChemical Weathering
Process by which rocks are Process by which rocks are decomposed, dissolved or loosened decomposed, dissolved or loosened by chemical processes to form by chemical processes to form sedimentsediment
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http://academic.brooklyn.cuny.edu/geology/leveson/core/topics/weathering/picture_gallery/display/graphics/yorkshire_72.gif
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http://cse.cosm.sc.edu/erth_sci/Soil/ss12_2.jpg
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http://www.geol.lsu.edu/Faculty/Ferrell/class/ClarkCreek/weathering_img3.gif
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ErosionErosion
The removal of weathered rocks by The removal of weathered rocks by the action of:the action of:– Water Water – WindWind– IceIce– Gravity Gravity
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Water Erosion Water Erosion
http://www.greenpeace.org/raw/image_full/russia/en/photosvideos/photos/trees-can-stop-water-erosion
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Close to Home – Canyon LakeClose to Home – Canyon Lake
http://www.cceo.org/gorgesite/index.htm
After the Flood
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Close to Home – Beach Erosion Close to Home – Beach Erosion
Three feet a year in some places!http://tamusystem.tamu.edu/systemwide/06/01/photos/erosion.jpg
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Wind Erosion Wind Erosion
http://www.helsinki.fi/~jhyvonen/PB/M/wind%20erosion%202-pp.JPG
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http://www.uwsp.edu/geo/faculty/ritter/geog101/textbook/images/lithosphere/eolian/wind_erosion_New_Mexico_p0772931600_NRCS.jpg
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http://www.ram.org/pictures/sights/oahu_san_diego/cabrillo_erosion_1.gif
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Ice ErosionIce Erosion
http://www.swisseduc.ch/stromboli/etna/etna00/etna0002photovideo/icons/f20.jpg
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http://www.sciencedaily.com/images/2005/12/051211220547.jpg
http://chandi.smugmug.com/photos/26411520-L.jpg
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GravityGravity
http://www.mariposacounty.org/fire/images/images%202006/web%20140%20rock%20slide%207-4-06%20004.jpg
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http://people.hofstra.edu/faculty/j_b_bennington/ny_geology/adirondacks/adirondacks-Images/10.jpg