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GEO 101

by: Daisha Fields

GEO 101 101

Daisha Fields
GPA 3.0
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About this Document

Dr. Konen Lecture Slides
Intro to evironmental geography
Dr. Mike Konen
Class Notes




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This 4 page Class Notes was uploaded by Daisha Fields on Tuesday April 26, 2016. The Class Notes belongs to 101 at Northern Illinois University taught by Dr. Mike Konen in Spring 2016. Since its upload, it has received 35 views. For similar materials see Intro to evironmental geography in GEOG at Northern Illinois University.


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Date Created: 04/26/16
Tuesday, April 5, 2016 2:11 PM 2. Depositional Landforms A) Moraine- same as alpine i. End ( Terminal) - same as alpine ii. Recessional - same as alpine iii. Ground - same as alpine B) Drumlin Elongated , elliptical hills Occur in swarms Often comprised of " molded" till Parallel to ice flow direction C) Outwash Plain Low lying , flat area beyond ice margin where braided stream network deposits sand and gravel, not confined . D) E) Glacial lake plains Flat areas made up of glaciolakes  Modern lakes are abundant in recently glaciated F) isolated sinuous ridge of sand and gravel former stream channels in , under , and / or on ice. G) Kame Isolated conical hills comprised of Illinois has been glaciated multiple times during the Quaternary * Prior to glaciation 100;s of millions of years if stream eroison Illinois looks like Kentucky … ( galena area also ) Eolian system Aeolus - Greek mythology, ruler of the winds . Wind is an excellent sorter of material Important agent in shaping the land Eolian processes: 1. Erosion 2. Deflation - removal of sediment and lowering of land surface Desert pavement - lag , armor particles too large for wind to move Abrasion- grinding , sandblasting of particles by wind  Leads to desert polish Transportation: Surface creep- particles rolling or sliding on surface  20% Saltation- bouncing of sand particles along surface  4 inch zone from ground  Dislodge , abrade, and polish other particles  Knocks smaller particles up into suspension m  80% Suspension - air column transport  Finest particles  Dust & aerosols  Found everywhere on earth- cesium in Antarctica. 3. Deposition A) loess  Windblown silt ( 80% silt sized particles)  Sorted  Stratified ( difficult to tell as particles are uniform size )  Contains very little sand  May contain some clay Sand = 2-0,05 mm Silt =0.005-0.002mm Clay=<0.002 mm  Distribution Loess distribution & origin Glaciation link  Outwash in valleys  Unvegetated  Daily and seasonal desiccation  Saltation of sand  Detachment of silt Transport of silt via suspension   Deposition  Decreased wind velocity  Vegetation trap  Topographic trap Surficial material in most of DeKalb county and Illinois Thins and fines downwind from the source Mississippi rive, green river lowland and Illinois river are major source area in illinoi s Illinois: thin eastward Deposited in Midwest -- 55,000-12,50BP DeKalb country - 3-5 feet Loess in NE IL younger than till ( superposition) 15,500-12,50 yrs BP loess deposition on till 3feet /3000 years =0.001 feet/year =0.012 in/yr =0.1 ft/100 yr For loess system to " go" requires :  Wind sediment source  No vegetation on source  Desiccation at source Related to glacial , fluvial , Volcanic Eolian deposit - 0.6 million years C) Eolian sand - windblown sand Dunes - mounds ,ridges , hills of eolian sand  Comprised of sand sized particles  Sorted  Stratified ( difficult to tell as particles are uniform size ) Dune migration & morphology Windward slope Leeward slope Slip face Angle of repose 30-40 common ''types of dunes : 1. Crescentic Uniform wind direction Perpendicular to wind direction Barchan - limited sand supply Transvers- abundant sand supply LECTURES ARE ONLINE … 4/21/16 kARST : PROCESSES and landforms asssociated with chemical weathering ( carbonation & solution) of limestones and dolostones) 15% of earth's land area impacted An important type of carbonation and solution weathering Enhanced by elevated co 2 in soil atmosphere Karst landforms  Sinkholes  Caves & Caverns  Disappearing streams Water quality impactsg Climate Temp- in general, 10C


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