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20 Cards in this Set
- Front
- Back
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Ice Sheets
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cover areas of continents greater than 50,000km
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Ice Caps
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smaller and tend to cover only the highest relief
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Ice Shelves
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floating masses of ice
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Valley Glaciers
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glaciers confined by valley sides
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Cirque Glaciers
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small in area and tend to occupy hollows
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Piedmont Glaciers
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where valley glaciers spill onto lowland areas
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Glacier System
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balance between inputs and outputs
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Inputs
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precipitation, avalanches, rock debris, heat energy, melt water
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Outputs
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sublimation, ablation, sediment, heat energy
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Stores
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snow, ice, debris
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accumulation zone
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where accumulation exceeds ablation
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ablation zone
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where ablation exceeds accumulation
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firn line
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divides the accumulation zone and ablation zone
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annual budget
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total ablation for a year- total accumulation for a year
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Advance
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a growing glacier
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Retreat
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a contracting glacier
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Cold (polar)
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high latitude location, low relief, pmp below basal temps, slow rates of movement
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Warm (temperate)
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high altitude locations, steep relief, pmp at or near basal temps
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Basal Sliding
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thin film of melt water exists between the ice and the valley floor so friction is reduced; main movement process for warm glaciers
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Internal Deformation
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main movement process of cold glaciers, which must move by means of internal deformation.
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