MARTIN BOND / SCIENCE PHOTO LIBRARY MARTIN BOND / SCIENCE PHOTO LIBRARY
Coastline. The formerly-horizontal bands of limestone (white) have been folded into arches, or anticlines, by movements of the Earth's crust. Limestone is a sedimentary rock. There is a small cave beneath the pointed anticline at lower right. This is Cemaes Head near Cardigan in the Pembrokeshire Coast National Park, Wales.
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