SEE: Glaciation: 2A.7: Erosional Processes

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  • 2A.7: Erosional processes
    • Subaerial processes
      • Freeze thaw
        • 1. Water seeps into cracks in rock
        • 2. Freezes when temp falls and expands by 9%
        • 3. Process is repeated, eventually rock shatters
      • Mass movement
        • Movement of material downslope due to gravity
    • Plucking/quarrying
      • 1. Meltwater freezes part of the underlying bedrock to the base of the glacier
      • 2. Any loosened rock fragments are then 'plucked' away as the glacier moves forward
      • Surface is left very uneven where rocks have been 'plucked'
    • Basal melting
      • Glacier moves when meltwater lubricates base of the glacier
      • Untitled
    • Abrasion
      • Large rocks carried below the ice scratch the bedrock and form striations
      • Surface is worn away overtime, smooth surface
      • Entrainment- surface sediment is incorporated into flow via erosion

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