Costal erosion

HideShow resource information
  • Created by: Natalie
  • Created on: 24-03-14 19:05

1. Wetting and Drying

  • plant root can prise rocks apart on cliffs where they grow, creating small cracks which thicken and deepen with age. Birds, animal, and marine organisms dig burrows in cliff
  • when saltwater enter a rock, it is often evaporated, leaving behind salt crystals. These crystals grow larger and exert stress onto rock- causing it to break apart. Salt is also capable of corroding rock
  • frequent cycle of wetting and drying are common on shore. Rocks rich in clay expand when wet and contracts when dry- causes cracks and breakdown
  • water percolates into cracks in the rock, when it freezes it expands in volume by 10%- exerting stress and forces cracks to widen. Rocks are broken away and collected at base of cliff (scree). Fragments are picked up by sea and use in further erosion
1 of 14

Other questions in this quiz

2. Attrition

  • breaking wave traps air as it hits cliff face. Air is forced into cracks in rock face, creating pressure at this point. As wave retreats, pressure is released. Overtime this weaken the cliff face, and huge chunks of cliff can break off due to force o
  • the already eroded materials are eroded down further as the sediment knock together in the sea
  • sea water contains weak acids which work to slowly dissolve carbonated rocks such as limestone
  • the sea hurls already eroded material (sand, shingle, boulders) against cliff face. This breaks down the rock on the cliff face

3. Carbonation

  • rocks such as limestone which contain calcium carbonate are slowly dissolved. Sea water forms a weak carbonic acid and when it absorbs carbon from air, it forms calcium bicarbonate which dissolve limestones.
  • when saltwater enter a rock, it is often evaporated, leaving behind salt crystals. These crystals grow larger and exert stress onto rock- causing it to break apart. Salt is also capable of corroding rock
  • frequent cycle of wetting and drying are common on shore. Rocks rich in clay expand when wet and contracts when dry- causes cracks and breakdown
  • plant root can prise rocks apart on cliffs where they grow, creating small cracks which thicken and deepen with age. Birds, animal, and marine organisms dig burrows in cliff

4. Biological weathering

  • frequent cycle of wetting and drying are common on shore. Rocks rich in clay expand when wet and contracts when dry- causes cracks and breakdown
  • plant root can prise rocks apart on cliffs where they grow, creating small cracks which thicken and deepen with age. Birds, animal, and marine organisms dig burrows in cliff
  • when saltwater enter a rock, it is often evaporated, leaving behind salt crystals. These crystals grow larger and exert stress onto rock- causing it to break apart. Salt is also capable of corroding rock
  • water percolates into cracks in the rock, when it freezes it expands in volume by 10%- exerting stress and forces cracks to widen. Rocks are broken away and collected at base of cliff (scree). Fragments are picked up by sea and use in further erosion

5. Rockfall

  • movement of individual soil particles when the ground is saturated.
  • rapid movement of rock down a side plane
  • individual rock fragments fall off a cliff face, due to freeze thaw
  • saturated soil flows downhill, triggered by heavy rain

Comments

No comments have yet been made

Similar Geography resources:

See all Geography resources »See all Coastal environments resources »