Coastal Erosion, Seastack

Coastal Erosion, Seastack

C025/8986 Rights Managed

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Credit: DAVID PARKER/SCIENCE PHOTO LIBRARY

Caption: Coastal erosion. This image shows a present day seastack off the coast of Kythira, Greece. C025/9001 is a simulation of the same feature at an earlier stage showing how the connecting arch (keystone) prior to collapse, might have looked a few centuries previously. A sea arch is a natural opening eroded out of a cliff face by marine processes, arches are therefore ephemeral geological landforms. They develop where waves attack a plane of weakness which cross-cuts a promontory. Caves produced on either side of a promontory might be joined over time to become a tunnel and, finally, an arch. Ultimately the keystone itself will erode leaving only a seastack. The architecture of an arch and the speed of its erosion is a reflection of its lithology and structure.

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Keywords: arch, arches, architecture, beach, blue sky, cave, caves, cliff, cliff face, coast, coastal erosion, collapse, cythera, erode, eroded, erosion, geological, geology, keystone, kithira, kythira, landform, lithology, manipulated image, marine, natural arch, natural arches, pebbles, promontory, rock, roof, sea, sea arch, sea shore, seashore, seastack, simulation, stack, stone, storm, tunnel, wave, waves

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