Moving Rock Weathering & Erosion. Weathering  Processes that change the characteristics of rocks on the Earth’s surface  Must occur BEFORE erosion can.

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Presentation transcript:

Moving Rock Weathering & Erosion

Weathering  Processes that change the characteristics of rocks on the Earth’s surface  Must occur BEFORE erosion can happen  No movement is involved  Occurs when rocks are exposed to water, air or plants

Mechanical Weathering  BREAKS rocks into different shapes and smaller sizes  Jagged rocks usually become smooth

Abrasion  Breaking, grinding, wearing away of rock  Caused by wind and water nacres/images/rockpic5.jpg

Frost Action or Ice Wedging  Freezing water in cracks expands and breaks rocks

Plate Movement  The moving and sliding of tectonic plates wear away rocks as they slide past each other y/trs0demo/trs-0_files/geosystems12- 08%5B1%5D.jpg

Exfoliation / Temperature Change  Warming and cooling of rock causes top layers to break off in sheets pg

Close to Home – Enchanted Rock ges/965ERdome.jpg

Plants and Animals  Wedging of roots and burrowing of animals wears away rock s/ClarkCreek/weathering_img2.gif

Close to Home – Texas Hill Country

Chemical Weathering  Process by which rocks are decomposed, dissolved or loosened by chemical processes to form sediment

re/topics/weathering/picture_gallery/display/graphics/y orkshire_72.gif

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Erosion  The removal of weathered rocks by the action of: –Water –Wind –Ice –Gravity

Water Erosion ia/en/photosvideos/photos/trees-can-stop- water-erosion

Close to Home – Canyon Lake htm After the Flood

Close to Home – Beach Erosion Three feet a year in some places!

Wind Erosion pp.JPG

xtbook/images/lithosphere/eolian/wind_erosion_ New_Mexico_p _NRCS.jpg

rosion_1.gif

Ice Erosion ovideo/icons/f20.jpg

5/12/ jpg L.jpg

Gravity 6/web%20140%20rock%20slide% %20004.jpg

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