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Evidence of Erosion and Deposition

Evidence of Erosion and Deposition. Sarah Fink Minerva Central School 2006. Agents of Erosion. Running water Wind Ice (Glaciers) Gravity Waves. http://people.csail.mit.edu/manoli/gallery/goldengate/waves.jpg

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Evidence of Erosion and Deposition

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  1. Evidence of Erosion and Deposition Sarah Fink Minerva Central School 2006

  2. Agents of Erosion • Running water • Wind • Ice (Glaciers) • Gravity • Waves http://people.csail.mit.edu/manoli/gallery/goldengate/waves.jpg http://www.peterbindon.com/Photography/Images-Photography/Landscape/Running_Water.jpg http://www.uwsp.edu/geo/faculty/ritter/images/lithosphere/glacial/piedmont_glacier_Baffin_GSC_2crev.jpg http://www.me3.org/issues/wind/zondturbines.jpg http://usuarios.cmg.com.br/~hp-adrenace/adrena2.jpg

  3. Quiz Yourself! • For each of the following 13 pictures, write down the major agent(s) of erosion. • Remember, your choices are: • Running water • Wind • Ice (Glaciers) • Gravity • Waves Note: sources for photos in the quiz are noted in the answers.

  4. Example 1 Answer

  5. Example 2 Answer

  6. Example 3 Answer

  7. Example 4 Answer

  8. Example 5 Answer

  9. Example 6 Answer

  10. Example 7 Answer

  11. Example 8 Answer

  12. Example 9 Answer

  13. Example 10 Answer

  14. Example 11 Answer

  15. Example 12 Answer

  16. Challenge Question: Answer

  17. How Did You Do?? Even if you didn’t get all of the answers correct, you should be able to recognize some patterns for the agents of erosion we discussed. Let’s see some more pictures and come up with some “rules” for identifying and classifying eroded rocks.

  18. Abrasion of stream bed (can form potholes) Dissolution Scour (lifting of loose particles) Sandbars Point bars Meanders Floodplains Levees Deltas Alluvial fans Running Water

  19. Water erosion – dry streambed Stream gully Dry delta http://www.bioschool.co.uk/bioschool.co.uk/images/images/water%20erosion_JPG_JPG.jpg

  20. Water erosion – river rock http://www.ecotrust.org/copperriver/crks_cd/content/pages/photographs/images/ riverrock.jpg

  21. Water erosion – kettle holes http://www.alabamaatheist.org/naturalism/graphics/040607_017.jpg

  22. Water erosion - Grand Canyon Colorado River http://www.grand-canyon-tours.biz/Grand%20Canyon%203.jpg

  23. Water erosion on Mars? http://nmp.jpl.nasa.gov/ds2/mission/images/water-erosion.gif

  24. Characteristics of erosion by running water:

  25. Deflation Abrasion Dunes Loess (layers of fine silt) Wind

  26. Wind erosion - ventifacts Flat sides show the prevalent wind direction http://www.uwgb.edu/dutchs/EarthSC202Slides/windslid.htm

  27. Wind erosion – sand dunes http://www.ncdc.noaa.gov/paleo/drought/images/sanddune_thumbnail.jpg

  28. Wind erosion – ripple marks http://academic.emporia.edu/aberjame/struc_geo/primary/prim17.jpg

  29. Wind erosion – desert pavement http://www.uwgb.edu/dutchs/geophoto/aeolian/DPAVMT1.jpg

  30. Wind erosion in Antarctica http://www.uwgb.edu/dutchs/geophoto/aeolian/ANTVACX.jpg

  31. Wind erosion http://www.yorkshirewalks.org/diary/nidd2/2008.jpg

  32. Wind erosion – Sahara Desert http://www.cosmicharmony.com/Ia/NaturWnd/Sahara.jpg

  33. Wind-eroded rocks in Zion, UT http://www.solarnet.org/Travel/US/Rock15MV.jpg

  34. Sand dunes on Mars http://images.spaceref.com/news/2004/2004.08.09.R1601009.gif

  35. Characteristics of erosion by wind:

  36. Ice wedging/Gravity Abrasion (striations, scouring, polishing) Plucking (carrying loose sediment) Till Moraine Drumlin Meltwater deposits Ice/Glaciers

  37. Glacial erosion – striations Striations (scratches) are parallel http://gemini.oscs.montana.edu/~geol445/hyperglac/eroproc1/boulderstriea2.JPG

  38. Glacial erosion – striations http://tauceti.sfsu.edu/~chris/wonderland/manoj087.jpg

  39. Glacial erosion – polish and erratic http://www.tarol.com/cathedral_erratic_glacial_polish.JPG

  40. Ice wedging http://www.visualsunlimited.com/images/ watermarked/112/112071.jpg http://facweb.bhc.edu/academics/science/harwoodr/GEOL101/Study/Images/ icewedge.jpg

  41. Hoodoos – stone columns Find out more! End Quiz http://www.cornellcollege.edu/geology/rdenniston/Texas%20pics/tent%20rocks.jpg http://www.izix.com/personal/travel/utah/images/hoodoos-w.jpg

  42. Formation of Bryce Canyon A combination of frost wedging and rainwater are the sources of weathering and erosion that cause the “hoodoo” formations found in Bryce Canyon, Utah. “Acid” rain formed by carbon dioxide in the atmosphere dissolves the weaker calcite-based limestone, but the stronger mudstone, siltstone, and dolomite layers weather more slowly. This results in the layering found in the rock formations. The average rate of erosion is 2-4 feet per 100 years. http://www.nps.gov/brca/geology_hoodoos.html

  43. Characteristics of erosion by ice:

  44. Slump Rock fall Landslide / debris flow Creep Solifluction (in areas with permafrost) Talus Gravity – Mass Wasting

  45. Gravity as agent of erosion http://www.enhg.org/gallery/shams/shams11.jpg

  46. Rock slides in Alaska http://www.alaskahunts.net/alaska/hikingonslide.JPG

  47. Gravity – talus slopes at cliff base http://www.kidscosmos.org/kid-stuff/mars-trip-graphics/talus-boulders-18-2p.jpg

  48. Soil creep caused by gravity http://www.mountainnature.com/images/Geology/Large/SoilCreep01.jpg

  49. Solifluction – due to permafrost Alternate seasons of freezing and thawing of saturated permafrost results in gradual soil movement downhill. http://www.fettes.com/Cairngorms/images/solifluction_siberia.jpg

  50. Characteristics of erosion by gravity:

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