physical geography river cards post mocks

?
  • Created by: charlie
  • Created on: 10-05-14 10:38
pressure release
rocks (granite) formed as igneous intrusions under pressure // weathering + erosion remove overlying rock // pressure released // underlying rock expands // fracture + vulnerable
1 of 15
Exfoliation / insolation weathering
large temp change // heating + cooling // (expansion + contraction) // stresses in rock layers // outer layers quicker than inner // outer layers peel off
2 of 15
oxidation
oxygen (aq) react with rock minerals (especially iron) // form oxides + hydroxides // weakens // disintegrates // discolours
3 of 15
hydrolysis
water + rock minerals = insoluble precipitate // achilles heel of granite (feldspar --> kaolinite (china clay)
4 of 15
carbonation
rain + CO2 --> weak carbonic acid // converts to soluble CaCO + H2O + CO2 // then insoluble calcium bicarbonate
5 of 15
soil creep (solifluction)
turf binds to top layer of soil // underneath layers are able to move freely // water inc. weight + dec. gravity // particles move past each other (soil creep plus - permafrost regions - wetter)
6 of 15
slump
increased weight + decreased friction in permeable top layer rock
7 of 15
meanders
sinuosity ratio 1.5 or more // water flow deflected (upper course interlocking spurs) // lower down more pronounced bends (lateral erosion)
8 of 15
levees
water floods // loses competence // deposits material
9 of 15
braided channels
loose coarse sediments caused by marked regime (monsoon // snow melt // glacial streams // competence)
10 of 15
deltas
river slows // loses competence when entering stationary body of water
11 of 15
base level change - rejuvenation
more energy // EUSTATIC MOVEMENT (sea levels fall + onset of glaciation) // ISOSTATIC MOVEMENT (land level rises + tectonic movement after glaciation)
12 of 15
base level change landforms - submergent
RIAS (drowned river valleys when flowing perpendicular) DALMATION COAST (when flowing parallel) FJORD (flooded glacial valley)
13 of 15
base level change landforms - emergent
RAISED BEACHES // RELICT CLIFF (raised cliff // stacks // stumps // caves)
14 of 15
base level change effects
mixing of salt and fresh water // loss of habitats // settlement loss // increased insurance // increased flooding
15 of 15

Other cards in this set

Card 2

Front

large temp change // heating + cooling // (expansion + contraction) // stresses in rock layers // outer layers quicker than inner // outer layers peel off

Back

Exfoliation / insolation weathering

Card 3

Front

oxygen (aq) react with rock minerals (especially iron) // form oxides + hydroxides // weakens // disintegrates // discolours

Back

Preview of the back of card 3

Card 4

Front

water + rock minerals = insoluble precipitate // achilles heel of granite (feldspar --> kaolinite (china clay)

Back

Preview of the back of card 4

Card 5

Front

rain + CO2 --> weak carbonic acid // converts to soluble CaCO + H2O + CO2 // then insoluble calcium bicarbonate

Back

Preview of the back of card 5
View more cards

Comments

No comments have yet been made

Similar Geography resources:

See all Geography resources »See all Coastal environments resources »