Unit 5 Flashcards
What is Periglacial?
Periglacial describes a landscape that undergoes seasonal freezing and thawing
• Often contains permafrost
What is Permafrost?
Ground that remains frozen for 2 consecutive years or more
What is the unfrozen ground between permafrost called?
Talik
What is pore ice?
Ice that develops in pore spaces between soil/sediment
What is needle ice?
Ice that consists of narrow ice silvers that are up to several cm long
What is an ice wedge?
Downward narrowing lenses of ide that can grow up to 3m wide at surface and can extend 10m below ground surface
What is a Pingo
Circular ice-cored hills with a height between 3m to 50m and a diameter between 30m to 300m
• Categorised into Open and Closed Pingos
What is a Thermokast landscape?
Land surface characterised by irregular surfaces of marshy hollows and depressions formed as permafrost thaws due to a warming climate
What is the process of Solifluction?
As permafrost thaws the wet saturated active later soil flows under the influence of gravity
What is a Blockfield
A surface covered by large angular rocks
• Formed as a product of freeze thaw weathering
What is a Scree Slope?
An accumulation of freeze-thaw weathered rock fragments at the base of a cliff
What is a Protalus Rampart?
A ramp shaped mound of scree that forms in a similar way to a scree slope.
What is a Loess Deposit?
Fine rock debris transported and deposited by winds
