Periglacial Features and Landforms (AQA A-Level Geography): Flashcards
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10 cards from this deck
Periglacial environments definition
Periglacial environments definition
Cold landscapes with intense frost action & permafrost
Permafrost definition
Permafrost definition
Ground frozen continuously for 2+ years
Active layer definition
Active layer definition
Surface layer that thaws seasonally, up to 4m deep
Frost heave process
Frost heave process
Ice crystals expand soil volume, creating surface domes
Solifluction/gelifluction
Solifluction/gelifluction
Saturated soil flow from melting ice in active layer
Blockfield (Felsenmeer)
Blockfield (Felsenmeer)
Angular boulder spreads; 'sea of rocks'
Ice wedge characteristics
Ice wedge characteristics
Narrow ice-filled cracks, milky, 5cm-10m+ wide
Pingo definition
Pingo definition
Dome-shaped, ice-cored mound in periglacial areas
Closed system pingo formation
Closed system pingo formation
Hydrostatic pressure from water under former lake beds
Thermokarst
Thermokarst
Ground depressions from ice melting in permafrost