Final answer:
Sea arches are primarily formed through wave erosion along coastal cliffs.
Explanation:
Sea arches are most likely formed due to wave erosion. They occur when waves erode both sides of a cliff, creating a hole in the cliff structure.
Wave action and strong longshore currents can carve a cave into a headland, and if the erosion extends all the way through, it becomes an arch.
Over time, wave erosion can lead to the formation of various coastal features such as sea arches, sea stacks, and wave-cut cliffs.
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