Stage 1: waves attack a weakness in the headlands- this creates a crack.
Stage 2: As wave attack a weakness, an opening begins to grow and a cave is formed on the sea cliff.
Stage 3: Arches are formed by continuous growth of sea caves. Many times, arches form by the meeting of two sea caves.
Stage 4: The roof of the arch becomes weak enough to collapse & be a sea stack. Sea stacks are tall, steep sided islands near shore. Over time it'll erode to become a stump.
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