geo case studies
- Created by: Sophie Goldberg
- Created on: 28-04-13 22:28
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Clues
- basal slip - meltwater at base, internal deformation, ice crystals deform slide past eachother, 20m per day usually 100m per year, steeper slope, thicker ice, more meltwater = faster (4, 7, 8)
- cities grows, desert shrinks, npp reduced affects all food web, ground water use, fences - pronghorne antelope, swimming pools, offroading, agriculture - overgrazing, native cotton woods replaced by buffer grass - bush fires (4, 7, 7)
- driving forces must be >resisting forces, driving - act down slope eg gravity, resisting forces - can be equal but never bigger eg rock structure, water - act as lubricant (6, 4, 8)
- eustatic - global sea levels due to climate change, flandrian transgression 6000 years ago rose 120m, steric effect, isostatic - land changes height, rebound after ice age, tectonic activity, emergent - features rise up, submergent - features sink (6, 3, 5, 6)
- free from snow ice, landforms still seen, >600mm ppt relief rainfall, thin air, cant hold much heat, windy - air channelled between stratosphere and troposphere (4, 8, 7)
- hydraulic action - phneumatic pressure relased, air expands cracks open, abrasion - waves throws particles at cliffs, create notch, attrition - small particles erode each other, deposited or transported (6, 6, 7)
- last true wild frontier USA, 19.6 million acres, area 1002 - 1.5 million acres, dry winters, 3 biomes: wetlands, coastal plains, drier areas, low npp, 12-37mm ppt, 5 endemic mammals (4, 4, 11)
- saguaro cactus - loose 80% water, can store 5 tonnes water, wide roots, creosote bush - stomata closed during day, long lateral tap roots, extract soil moisture, verbena - desert annuals, germinate post rainfall, flower, seed die avoid drought (4, 5, 11)
- terminal - cordillera huyhuash peru, lateral - vadret da tschierva switzerland, medial - breithorn zematt switzerland, recessional - steigletscher switzerland (4, 7, 8)
- weaknesses eg joints bedding plains faults folds, can have strong lithology and weak structure (6, 4, 9)
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