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TODAY PowerPoint Presentation

TODAY

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TODAY

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  1. TODAY Get out your ESRT and a piece of paper The following questions are from your ESRT. You’ll have a minute per question…

  2. Question 1 What are 2 examples of weathering?

  3. Question 2 What is the difference between soil and dirt?

  4. Question 3 What is the P-wave travel time for 4000 km?

  5. Question 4 What layer of the earth has a greater temperature than melting point?

  6. Answers • Two examples • Abrasion, Frost action • Soil and Dirt? • Darker, particle size • P-wave travel time for 4000 km? • 00:07:00 • What layer of the earth has a greater temperature than melting point? • Outer Core

  7. Erosion Movement of weathered particles

  8. Vocab • Agents of erosion • Suspension • Saltation • Creep • Angle of repose • Mass wasting

  9. Weathering Breaking down of rocks and other particles into smaller pieces Erosion Transport of the weathered particles. Weathering Vs Erosion TALUS ?

  10. Agents of Erosion • Gravity • Water • Wind • Ice

  11. Water • Water when driven by gravity can be very powerful. • Think of the drainage ditch after it rains – does the water flow fast? Is it clean?

  12. Wind • 3 things to know. • Suspension – Stuff in the air • Saltation – Bouncing • Creep – Rolling on the ground Dust bowl, Causes???

  13. Ice • Glaciers move ice down a slope picking up sediments along the way. • Long Island is simply glacial Poop!

  14. Gravity • Gravity drives all erosion, but one form more important to know is mass movements. • This is when the soil fails and falls or slides down a slope. • Angle Of Repose • Angle where material stays on surface!

  15. Mass movements • Slump • This is when the land slides down equally. • Slide • This is when the land slides down not equally. • Fall- avalanche • The land falls • Flow • The land is liquefied and flows down.

  16. Things that will increase mass movements • Change water content • Change slope • Change mass • Change vegetation • Change human activity

  17. Tully Landslide ‘91 ¼ mile http://pubs.usgs.gov/of/1994/ofr-94-0615/tvstudy.htm

  18. Tully Landslide • April 30, 1993. After a long winter full of rain and snow. The saturated land gave away and began to flow down the hill.

  19. Deposition What is this? What controls this?

  20. Deposition • This is like going to the bank geologically. • Weathering breaks the rocks up • Erosion moves the particles. • Deposition leaves the particles on the ground.

  21. Factors • Particle Size • How big the sediments are. • Shape • Round or flat • Density • Weight and composition • Settling rates • How fast things settle

  22. Sorting Vs Unsorted • ESRT page • How to find sediment size. • How to find Speed.

  23. Ways to deposit • Glaciers • Sorted or Unsorted • Streams (Water) • Sorted or Unsorted • Wind • Sorted or Unsorted • Mass movements (gravity) • Sorted or Unsorted

  24. Gravity • Gravity alone does not sort sediment • Landslides are the main form of gravity deposition. • Why are sediments unsorted?

  25. Glaciers • Glaciers leave sediment unsorted. • Like gravity Land slides • What moves the glacier?

  26. Water • Streams, Rivers deposit sediment in sorted layers. • Why are sediments sorted?

  27. Wind • Wind like water sorts sediments. • Why are sediments sorted?

  28. Wind • Wind like water sorts sediments. • Why are sediments sorted?