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      Coastal erosion landforms

      I can describe the characteristics and explain the formation of landforms resulting from coastal erosion.

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      Lesson 4 of 9
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      • Year 10
      • AQA

      Coastal erosion landforms

      I can describe the characteristics and explain the formation of landforms resulting from coastal erosion.

      Lesson details

      Key learning points

      1. Caves, arches and stacks have distinct characteristics and formation.
      2. Cliffs and wave cut platforms have distinct characteristics and formation.

      Keywords

      • Hydraulic power - waves compress air into cracks in the rock, putting pressure on it and causing it to break over time

      • Erosion - the wearing away of rock along the coastline

      • Retreat - the process by which a coastline, cliff, or other landforms move inland due to erosion

      Common misconception

      Caves, arches, stacks and stumps form very quickly and at the same time.

      Coastal landforms form over time through erosion and weathering, progressing from caves to arches, which collapse into stacks, and eventually erode into stumps, show gradual and differential erosion processes that shape the landscape.

      GIS can be utilised to study an area's geology, helping to determine whether a coastline has the potential to develop these erosional landforms.
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      This content is © Oak National Academy Limited (2025), licensed on Open Government Licence version 3.0 except where otherwise stated. See Oak's terms & conditions (Collection 2).

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      Prior knowledge starter quiz

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      6 Questions

      Q1.
      What is the main difference between constructive and destructive waves?

      Constructive waves have a stronger backwash than swash.
      Constructive waves are shorter and steeper than destructive waves.
      Correct answer: Constructive waves deposit more sediment, building up the beach.
      Destructive waves are only found during storms.

      Q2.
      What is fetch?

      Correct answer: The distance over which the wind blows across the sea to generate waves.
      The height of waves as they approach the shore.
      The depth of the sea near the coast.
      The amount of sediment carried by a wave.

      Q3.
      Which of the following is an example of biological weathering?

      Rocks breaking down due to freeze-thaw action.
      Acid rain reacting with limestone.
      Correct answer: Plant roots growing into cracks and breaking the rock apart.
      Erosion caused by flowing water.

      Q4.
      What is a concordant coastline?

      A coastline where the rock layers are perpendicular to the shore.
      Correct answer: A coastline where bands of different rock types run parallel to the shore.
      A coastline formed exclusively by volcanic activity.
      A coastline made up of uniform rock material throughout.

      Q5.
      How are bays and headlands typically formed?

      By the deposition of sediment in sheltered areas.
      Through the buildup of coral reefs over time.
      By tectonic plate movement creating uplifted areas.
      Correct answer: By the erosion at different rates of hard and soft rock along the coastline.

      Q6.
      Which statement best defines hydraulic power?

      The process where rocks are dissolved by acidic water.
      Correct answer: The force of water breaking rock particles away from the cliff.
      The movement of sediments in a circular motion due to wave action.
      The chemical reaction between seawater and rocks.

      Assessment exit quiz

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      4 Questions

      Q1.
      Correctly order the statements to show the formation of a wave cut platform.

      An image in a quiz
      1 - Waves hit the base of the cliff, applying pressure on the rock.
      2 - Wave energy erodes the rock at the base, forming a notch.
      3 - The notch deepens as waves continue to erode the rock.
      4 - The cliff above the notch becomes unstable and weakens.
      5 - Eventually, the cliff collapses due to lack of support.
      6 - This leaves a flat area called a wave-cut platform.
      7 - The process is repeated as the cliff retreats.

      Q2.
      What is a discordant coastline?

      Where harder and softer rock layers run parallel to the shore.
      Correct answer: Where harder and softer rock layers run perpendicular to the shore.
      Where faults and joints weaken the rock of a coastline.
      A coastline formed by river deposits.

      Q3.
      Reorder the steps for freeze-thaw weathering to show the correct sequence.

      1 - Water seeps into cracks in the rock.
      2 - Water freezes and expands in the crack.
      3 - Expansion puts pressure on the rock.
      4 - The repeated process breaks the rock.

      Q4.
      Which of the following is the best description of abrasion?

      Rocks are dissolved by acidic seawater.
      Correct answer: Sediment and rocks are hurled at cliffs, scraping the cliff face.
      Air is compressed in cracks by waves, causing erosion.
      Water infiltrates rocks, causing them to break apart.

      Lesson appears in

      UnitGeography / Coastal landscapes

      AQAGeography

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