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27 Cards in this Set
- Front
- Back
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% of freshwater that is frozen |
77% |
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Glaciers classified by 3 things |
morphology flow dynamics thermal properties |
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Glacial mass balance |
balance between inputs/outputs of snow, ice and water bm = accumulation - ablation bm> 0 , growth, advancing terminus bm < 0, shrinking, retreating terminus |
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terminus |
end of the glacier at any given time |
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4 types of materials in glacier |
snow firn (between snow and ice) - granulated crystals impure glacial ice (has air in it) true glacial ice (no air in it) density goes top to bottom, cause intuition |
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glacial ice formation |
1. snow survives summer 2. more snow falls, compacts previous years snow 3. repeat until yous got a glacier |
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glacial flow - 3 types |
basal sliding - sliding at base, warm glaciers only, sporadic plastic flow - typical flow lol shearing- shear movement along fractures |
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firn line |
basically the snow line on mountains, but glaciers |
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accumulation zone |
area where snow is accumulating, is above the firn line |
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ablation |
loss of mass due to: melting, sublimation, and deflation |
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deflation |
erosion due to wind blowing things away |
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ice flow as geomorphic process |
scours/ erodes rock traps other rocks and stuff and bull dozes stuff and drags along the surface of things |
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cirques |
amphitheater shaped basin at the head of an alpine glacier |
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erosional landforms |
horns aretes u shaped valleys grooves/striations roche moutonees |
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horns |
formed from several cirques gouging a peak |
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aretes |
formed from erosion on both sides |
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u shaped valleys |
glacier going hella deep then retreating, and having a stream running through it helps |
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roche moutonees |
asymmetric slope of bedrock - steep on one side, not so much on the other |
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depositional landforms |
glacial outwash plain moraines eskers drumlin kettle lakes erratics proglacial lakes |
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glacial outwash plain |
basically a braided stream from glacier run off |
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moraines |
when glaciers deposit rock they were carrying terminus moraine - furthest advance recessional - built while terminus recedes lateral- on the side of a moraine medial- between two glaciers that be moving beside eachother |
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eskers |
long curving ridge of gravel that forms by filling up stream channel in a glacier |
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drumlin |
hill of unsorted till, shaped like a mini sperm |
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kettle lakes |
ice that was penetrating the ground, melts and fills with water |
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glacial erratics |
carries a rock hella far and leaves it there like hey dude you can stay here please |
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proglacial lakes |
formed by the damming action of a moraine or ice dam |
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things that erosional/depositional land forms tell us |
reveal past flow rates and ice extent |
