coastal erosion

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  • coasts and rivers
    • weathering
      • mechanical
        • break up with no chemical change
          • e.g. freeze-thaw
      • chemical
        • dissolving rock
          • acidic rain/ sea water
      • biological
        • e.g. roots growing in rock
    • mass movement
      • rockfall
        • bits of rock fall off cliff-face; usually due to free-thaw weather ing
      • slides
        • large blocks of rock slide downhill
      • mudflows
        • saturated soil flows down slope
      • rotational slip
        • saturated soil slumps does curved surface
    • casual erosion
      • abrasion
        • pebbles grind along a rock platform or cliff base e.g. sandpaper. this rock eventually becomes smooth
      • attrition
        • rocks hit each other rand break
      • solution
        • seawater dissolves cliffs
      • hydraulic action
        • air in cracks compressed by waves
    • transpiration
      • solution
        • dissolved salts and materials
      • suspension
        • finer material suspended by waves
      • salutation
        • pebbles bounced
      • traction
        • heavier rocks rolled

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