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22 Cards in this Set
- Front
- Back
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Glaciers
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large, long lasting river of ice made of compressed recrystallized snow
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albedo
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reflecting power of a surface.
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zone of ablation
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Processes of ablation (where ice is lost) include melting, evaporation, iceberg calving, and sublimation.
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PROPERTIES OF ICE
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less dense than water
floats, expands, slippery |
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Moraines
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deposition of till that marks the former position of a glacier
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Striations
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glaciers scrape clean al soil to bedrock and leave scratches
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Mountain Glaciers
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Form in mountains and flow down valleys
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Continental glaciers
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covers whole continent
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U-shape Valleys
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Glacial valley
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Cirque
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bowl shape, may have small lake
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Tarn
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formed in a cirque excavated by a glacier
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lateral moraine
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deposits of till marking edge of glacier against valley wall
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medial moraine
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two valley glaciers coalesce, till marks boundary between two
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terminal moraine
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deposition of till to mark the line of its farther advance
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hanging valley
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when a tributary glacier flows into a glacier of larger volume
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arete
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two glacial valleys carve out a sharp ridge line
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horn
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two cirques carve out a horn
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ground moraine
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flat deposit below moving ice
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drumlin
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when land surface is molded into smooth elongated forms by glacier
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kettle lake
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glacier recedes, leaves chunk of ice, till piles up around ice, ice melts, leaves kettle pond
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erratic
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blocks of bedrock with foreign lithology that have been deposited by meting ice
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esker
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ling sinuous ridges of sand and gravel deposited by streams that ran under/within glaciers
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