SINCLAIR STAMMERS / SCIENCE PHOTO LIBRARY SINCLAIR STAMMERS / SCIENCE PHOTO LIBRARY
Eroded limestone cliffs at a coast. Limestone is a sedimentary rock formed by the deposition and compression of the shells of marine animals. It is susceptible not only to the usual erosive power of the sea, but also to karst-type erosion. This leaves surfaces with deep channels separating ridges. In this case, pools of seawater dissolve pits in the limestone, which get deeper as new seawater is thrown into them, which can dissolve more limestone. The same effect is can also be seen far from coast, when rainwater is the eroding agent. Photographed at Cabo Carvoeiro, Portugal.
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