Erosion of the Coast

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  • Erosion of the Coast
    • The Fetch
      • The fetch is the distance that the wave has travelled between lands
      • Affected by the prevailing wind
    • Bays and Headlands
      • Cordant coastline
        • Causes rounded bays
        • Rocks are parallel
      • Discordant coastline
        • Alternative bands of rock
        • Rock bands at 90 degrees to coast
      • Differential erosion
        • Soft rock is eroded by the waves
        • Hard rock is then eroded away as it has a large surface area
    • Erosion
      • Erosion of rocks
      • Transport
        • Rocks are moved along the beach. Prevailing wind causes the material to move in a zig-zag pattern. Bachwash caused by gravity.
        • Deposition
          • Rocks are placed in a spit shape at the end of the beach.
    • Erosion of a Headland
      • 1. Crack - Erosion of rocks.
        • 2. Cave - Cordant coastline
          • 3. Arch - Erosion of weak cave rock
            • 4. Stack - Unssupported rocks falling
              • 5. Stump - Erosion
    • Cliff Formation and Wave Cut Platform
      • This process is continuous and will repeat over and over again.
      • A notch is formed and unsupported rocks fall into the sea.
        • A cliff face forms and the cliff is retreating as a new notch is being formed. The sea carries away fallen rocks.
          • A wave cut platform has been created.


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