Attrition Large rocks and sediment in water Long shore drift: The movement of sediment along the collide and wear each beach other down Corrosion Large rocks and sediment thrown against the cliffs Groynes: beach protection against longshore drift Headlands and bays: Formed where there hard and soft rock. The soft rock is eroded away and the hard rock is not. Formation of caves, arches and stacks. A line of weakness called a appears in the rock This increases in size until it becomes a cave The waves erode the cave until the water breaks through the other side creating an arch The roof of the arch falls into the sea creating a stack The stack is eroded away to form a stump Case study: Coastal erosion: The twelve apostles Victoria, Australia Coastal deposition: Where: Formed: Port Campbell National Park, Victoria, Australia Headlands formed where the rock was harder Limestone cliffs formed in layers from the Hydraulic action, corrosion and corrosion eroded sediment on the sea floor forming sedimentary along the fault lines rock. Cliff base eroded away to form WAVE CUT 9 remaining stacks of rocks off the Victoria coast PLATFORMS, notches, arches, caves and stacks When the arches collapsed stacks were formed Beach Spit Bar Salt Large particles at the Caused by longshore If a spit connects two The water has very top of the beach and drift pieces of land little energy and so smaller particles like Deposition of sediment (eventually) it becomes deposits more and coast changes a bar and the water more sediment behind
Attrition Large rocks and sediment in water collide and wear each other down Corrosion Large rocks and sediment thrown against the cliffs Long shore drift: The movement of sediment along the beach Groynes: beach protection against longshore drift Headlands and bays: Formed where there hard and soft rock. The soft rock is eroded away and the hard rock is not. Formation of caves, arches and stacks. A line of weakness called a appears in the rock This increases in size until it becomes a cave The waves erode the cave until the water breaks through the other side creating an arch The roof of the arch falls into the sea creating a stack The stack is eroded away to form a stump Case study: Coastal erosion: The twelve apostles Victoria, Australia Where: Port Campbell National Park, Victoria, Australia Limestone cliffs formed in layers from the sediment on the sea floor forming sedimentary rock. 9 remaining stacks of rocks off the Victoria coast Formed: Headlands formed where the rock was harder Hydraulic action, corrosion and corrosion eroded along the fault lines Cliff base eroded away to form WAVE CUT PLATFORMS, notches, arches, caves and stacks When the arches collapsed stacks were formed Coastal deposition: Beach Spit Bar Salt Large particles at the top of the beach and smaller particles like Caused by longshore drift Deposition of sediment coast changes If a spit connects two pieces of land (eventually) it becomes a bar and the water The water has very little energy and so deposits more and more sediment behind
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