MARTIN BOND / SCIENCE PHOTO LIBRARY MARTIN BOND / SCIENCE PHOTO LIBRARY
Sea arch. Sea arch projecting from a cliff. To the right of the arch is a rock which used to be part of another arch. Sea arches are formed when a land promontory is comprised of rock that varies in permeability. The more permeable sections of rock are more porous, and the action of the sea erodes these to a greater extent. Initially, caves form on either side of the promontory and gradually grow deeper until they coalesce to form an arch. A sea arch will continue to be eroded by waves, growing wider until it collapses. Photograph of the Green Bridge of Wales in Pembrokeshire, Wales.
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