Flashcards
PW 5
Cards in this deck (14)
- 1What are the three main processes that glaciation provides the landscape with?-Entertainment and transport of sediment
-Erosion
-Deposition of sediment - 2What are the weathering processes going on at a glacier?-Ice is malleable
-Soft ice requires debris to erode hard rock
-Debris from headwall, frost action, rock fall and glacial plucking
-Plucking removes objects which have been initially moved by freeze-thaw weathering - 3What are the processes, relief type, relief shape and scales surrounding glacial erosion?
- 4What are microscale erosional landforms?-Erosion on a very small scale such as striation
Striation is caused by sediment moving in an opposite direction to the ice or at a different rate
-Transient stress concentrations leading to localised fracture - 5What are large scale erosion features?-Formation of corrie hollow and cirque glacier
-Angle tarn, lake district
-Rock basins - 6What happens to the eroded material?-Entrainment --> transport --> deposition
- 7What are examples of depotion landforms with scale?
- 8What are examples of subraglacial features and how they are formed-Medial moraines
-2 lateral moraines coming together creates medial moraine
-They run longtitudily down the glacier
-Thrust moraines
-Some come across the front of the glacier
-Glacier moving slower at the front and therefore ice piles up
-Debris stripes
-Glacier moves quicker at the centre then it does at the edges and therefore they get pulled - 9What are subglacial deposition processes?-Lodgement
-Melt-out
-Deposition by gravity - 10What landforms areassociated with subglacial landforms?-Fluting
-Drumlines
-Transverse to the direction of ice flow
-Crescentic ridges
-Lying transverse to the former ice flow
-Rogen/ribbed moraine
-Transverse ridges formed by stress release along shear planes at the glacier bed - 11What does fluting look like?
- 12How can glaciers adance and relocate sediment?-Squeezing and pushing
-Squeezing of saturated sediments from beneath ice margins
-Like a tube of toothpaste - 13What factors control the amount of sediment deposited at ice margins?-Balance between rates of ice retreat and sediment delivery
- 14What are the types of ice margin?-Stationary ice margin
-Material bought forward through glacier deposited on the same spot
-Large accumulations of depositional material
-Rapidly retreating ice margin
-Less debris released from the ice per unit of margin retreat
-Subglacial depositional features preserved
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- Flashcards on PW 5, created by erossmae on 25/08/2015.
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- erossmae
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