Coasts - Marine Processes Flashcards

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1
Q

What are the erosional processes at a coastline?

A
  • hydraulic action
  • abrasion
  • corrasion
  • attrition
  • corrosion
  • wave quarrying
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2
Q

Describe hydraulic action

A
  • waves hit the cliff face and push air into cracks
  • this high pressure widens the cracks
  • pieces of rock can eventually break off
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3
Q

Describe abrasion

A
  • sediment moving along the coastline
  • friction of them rubbing along the surface of the coast erodes it over time
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4
Q

Describe corrasion

A
  • during high tide, rocks smash into the cliffs
  • causes erosion to the cliff
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5
Q

What impacts corrasion?

A
  • the shape and size of the rocks
  • the energy of the waves
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6
Q

Describe attrition

A
  • rocks hit each other and wear down
  • result in smaller, smoother and rounder rocks
  • doesn’t really erode the coast
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7
Q

Describe corrosion

A
  • slightly acidic water can erode softer rock
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8
Q

How is climate change impacting how strong corrosion is becoming?

A
  • oceans are becoming more acidic due to global warming
  • increasing the levels of corrosion
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9
Q

Describe wave quarrying

A
  • waves break at the cliff face
  • can break off small pieces of rock
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10
Q

What are the factors affecting erosion? (explain them)

A
  • type of rock = softer rock will erode more quickly
  • waves = more powerful waves result in more erosion
  • sub-ariel processes = weathering or mass movement will increase erosion
  • beaches = will absorb the wave energy before it reaches the cliff
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