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Weathering/Erosion Refresher

Weathering/Erosion Refresher. Geomorphology study of the changing shape of the earth Weathering the breakdown of rock “in situ” (in place) Erosion the transport of weathered material Weathering is the beginning to changing the shape of the earth. Physical Geography Refresher: Weathering.

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Weathering/Erosion Refresher

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  1. Weathering/Erosion Refresher • Geomorphology • study of the changing shape of the earth • Weathering • the breakdown of rock “in situ” (in place) • Erosion • the transport of weathered material • Weathering is the beginning to changing the shape of the earth

  2. Physical Geography Refresher: Weathering • Chemical • Physical • Biological • Either physical stress or chemical decay

  3. Physical Geography Refresher: Basic Rocks: Igneous Basalt(Andesite)

  4. Physical Geography Refresher: Basic Rocks: Igneous Granite: lava cooled at great depth

  5. Physical Geography Refresher: Basic Rocks: Sedimentary Sandstone: notice bedding fissures Graduation Rock

  6. Physical Geography Refresher: Forming New Minerals rock coatings rock coatings

  7. What is an Index? • A way to Quantify the Unquantifiable

  8. Examples of Indices • From everyday Life? • Ranking movies, ranking hotels, ranking restaurants, best schools, best cities • From schooling? • SAT, your GPA, grading scales in classes • From geography? • Palmer Drought Severity index, sand mobility index, soil development index

  9. Another Example:Grading This Lab

  10. Selecting Index Elements • Out of how many? • A possible score of 10? 100? • Elements: • What scale? • 1 - 10? 1-5? 0-3? • Do you want to weight elements • What are you missing? • How to score

  11. How to Score Index Elements • List elements of scoring: • Fissures • What scale?

  12. How to Score Index Elements • Fissures • 0 not present • 1 present • 2 obvious • 3 dominant

  13. Analyst Discretion • May be concerned about specific environmental factors • One parameter might be extremely dominant • Choose a multiplication factor for any of the parameters • Example: • Extreme fissures

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