Glacial systems and landscapes 0.0 / 5 ? Geographysystems and processesA2/A-levelAQA Created by: RhodesNCreated on: 24-06-18 11:34 what is the galcial budget? relationship between accumalation and ablation 1 of 24 what happens if accumalation is greater than ablation? (and vice versa) glacier gains mass and glacier snout advances (and vice versa) 2 of 24 what happens if accumalation and ablation is equal? the galcier is stationary as snout remains in same place 3 of 24 what is an equilibrium line? shown on a glacier where accumalation equals ablation 4 of 24 what is the net accumalation zone? inputs are larger than outputs, glacier is gaining mass 5 of 24 what is the net ablation zone? outputs are larger than inputs, glacier is losing mass` 6 of 24 what are the largest galciers called? ice sheets 7 of 24 what are smaller domes of ice called? ice caps 8 of 24 what is an ice shelf? area of floating ice sheets attached to coastline 9 of 24 what is an ice field? relatively flat, extensive mass of ice 10 of 24 what is a valley glacier? body of ice moves down valley by gravity, bounded by rock walls on either side 11 of 24 what is a cirque glacier? valley glacier diverges from main galcier & crosses drainage divide through a diffluenece 12 of 24 what is a piedmont glacier? glacier leaves confining rock walls and spread out to form expanded glacier at foot of mountain valley 13 of 24 what are warm-based glaciers? found in hot areas, meltwater reduces friction and lubricates base causing lots of movement of material causing deposition 14 of 24 what are cold-based glaciers? found in cold areas, little melting or movement, much less erosion, transport and deposition 15 of 24 what are the three main ways a glacier moves? basal sliding, compressional and extensional flow, internal deformation 16 of 24 what is basal sliding? movement of large body of ice, due to pressure melting at its base causing it to be lubricated and allows galcier to slide 17 of 24 what is compressional and extensional flow? takes place when ice cannot deform sufficiently quickly to stresses beneath the ice 18 of 24 what is internal deformation? ice crystals set themselves in a line with the movement of the glacier and slide past each other, causing weaknesses 19 of 24 what is frost-shattering? and explain freeze-thaw weathering process 20 of 24 what is nivation? physical & chemical weathering under a patch of snow, due to seasonal temp changes, causes rock to disintegrate 21 of 24 what are strations? scratches on rocks in the direction of ice movement 22 of 24 what can glaciers cause erosion by? Plucking 23 of 24 what is plucking? bedrock beneath glacier weatehred can detach large particles of rock and take them with it 24 of 24
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