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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. - PowerPoint PPT Presentation
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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
• Chemical
• Physical
• Biological– Either physical
stress or chemical decay
Physical Geography Refresher: Weathering
Physical Geography Refresher: Basic Rocks: Igneous
Basalt(Andesite)
Granite: lava cooled at great depth
Physical Geography Refresher: Basic Rocks: Igneous
Sandstone: notice bedding fissures
Graduation Rock
Physical Geography Refresher: Basic Rocks: Sedimentary
rock
coa
tings
Physical Geography Refresher: Forming New Minerals
rock coatings
What is an Index?
• A way to Quantify the Unquantifiable
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
Another Example:Grading This Lab
Element of your grade Ranking ScaleWeighting(total pts)
Notebook: analysis of RASI training 0 1 2 3 x 2 (6)Notebook: evaluation of major RASI elements 0 1 2 3 x 3 (9)Notebook: observations of specific RASI elements 0 1 2 3 x 10 (30)Notebook: retrospective analysis 0 1 2 3 x 4 (12)
0 - blew it off1 - minimal job2 - many details3 - thoughtful withquestions and drawing
Scoring sheets 0 1 2 3 x 15 (45)0 - blew it off1 - obvious outlier (i.e.spent most of timesocializing & just filled inrandom pattern)2 - not an option3 - filled all sheetscarefully and thoughtfully
Grading Scale 90 - A80 - B70 - C60 - D
• 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
Selecting Index Elements
How to Score Index Elements
• List elements of scoring:– Fissures
• What scale?
How to Score Index Elements
• Fissures– 0 not present– 1 present– 2 obvious– 3 dominant
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