moving rock weathering & erosion grade 8; gle 14
TRANSCRIPT
Moving RockMoving Rock
Weathering & ErosionWeathering & Erosion
Grade 8; GLE 14http://www.science-class.net/Geology/weathering_erosion.htm
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
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
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
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
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
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
Close to Home – Enchanted RockClose to Home – Enchanted Rock
http://www.answers.com
http://geology.uprm.edu/Morelock/images/965ERdome.jpg
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
Close to Home – Texas Hill CountryClose to Home – Texas Hill Country
http://www.texasep.org/cpft/lugc.html
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
http://academic.brooklyn.cuny.edu/geology/leveson/core/topics/weathering/picture_gallery/display/graphics/yorkshire_72.gif
http://cse.cosm.sc.edu/erth_sci/Soil/ss12_2.jpg
http://www.geol.lsu.edu/Faculty/Ferrell/class/ClarkCreek/weathering_img3.gif
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
Water Erosion Water Erosion
http://www.greenpeace.org/raw/image_full/russia/en/photosvideos/photos/trees-can-stop-water-erosion
Close to Home – Canyon LakeClose to Home – Canyon Lake
http://www.cceo.org/gorgesite/index.htm
After the Flood
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
Wind Erosion Wind Erosion
http://www.helsinki.fi/~jhyvonen/PB/M/wind%20erosion%202-pp.JPG
http://www.uwsp.edu/geo/faculty/ritter/geog101/textbook/images/lithosphere/eolian/wind_erosion_New_Mexico_p0772931600_NRCS.jpg
http://www.ram.org/pictures/sights/oahu_san_diego/cabrillo_erosion_1.gif
Ice ErosionIce Erosion
http://www.swisseduc.ch/stromboli/etna/etna00/etna0002photovideo/icons/f20.jpg
http://www.sciencedaily.com/images/2005/12/051211220547.jpg
http://chandi.smugmug.com/photos/26411520-L.jpg
GravityGravity
http://www.mariposacounty.org/fire/images/images%202006/web%20140%20rock%20slide%207-4-06%20004.jpg
http://people.hofstra.edu/faculty/j_b_bennington/ny_geology/adirondacks/adirondacks-Images/10.jpg