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Lecture 16

Boulder, boulder, big and round, Tell me something, real profound. - Johnny Hart (B.C.) Glacial erosion . Lecture 16. Webpage for course (daytime). Webpage for course (nighttime). Lab midterm scores. 65 4 64 2 63 62 2 61 3 60 4 59 58 4 57 55 2 54 2

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Lecture 16

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  1. Boulder, boulder, big and round,Tell me something, real profound. - Johnny Hart (B.C.)Glacial erosion Lecture 16 Webpage for course (daytime) Webpage for course (nighttime)

  2. Lab midterm scores 65 4 64 2 63 62 2 61 3 60 4 59 58 4 57 55 2 54 2 53 52 49 47 45 40 39 31 26 2 17 3 11 2

  3. Ice Ages

  4. http://www.learner.org/courses/essential/earthspace/images/show6_ice_age.jpg&imgrefurlhttp://www.learner.org/courses/essential/earthspace/images/show6_ice_age.jpg&imgrefurl

  5. Geologic processes are usually slow Mountains come up, worn down Over millions of years Streams take a long time to Erode transport and deposit their grains The grains transported are small

  6. Glaciers Can erode larger portions of mtns Transport and deposit the material Over 10,000s years Grains can be the size of trucks

  7. Ice Ages

  8. Water Ice Flows slowly – bulldozer effect High viscosity – flows around obstructions

  9. Two general kinds (scales) of glaciation Alpine Continental

  10. Snow Accumulates in mtns colder weather – advances warmer weather - retreats Flows to lowlands

  11. In mountains – erosion on large scale Glacial quarrying (plucking) Abrasion Avalanching

  12. Glacial plucking

  13. Abrasion

  14. Cirques http://www.goldengatephoto.com/westus/greatbasin.html&usg

  15. Where several cirques meet - horn

  16. Aretes and Cols

  17. In valleys – transportation on large scale Glacial vs. Stream U-shape Less sinuous HUGE Hanging waterfalls

  18. Lets look at some photos

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