Wave-cut Platforms:
Waves cause most erosion at the foot of a cliff forming a wave-cut notch. The rock above the notch becomes unstable and eventually collapses. Collapsed material is washed away and a new notch starts to form. Repeated collapsing and retreating, leaving behing a wave-cut platform.
Headlands & Bays:
These forms where there are alternating bands of resistant and less resistant rock along a coast. The less resistant rock is eroded quickly and forms a bay, which has a gentle slope. The resistant rock is eroded more slowly and it's left jutting out, forming a headland.
Caves, Arches & Stacks:
Waves crash into the headlands and enlarge the cracks, causing a cave to form. Continued erosion deepns the cave until it breaks through, forming an arch. The rock supporting the arch eventually collapses from erosion, forming a stack.
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