MARTIN BOND / SCIENCE PHOTO LIBRARY MARTIN BOND / SCIENCE PHOTO LIBRARY
Limestone cliff. Limestone cliff overlooking a path used by leisure walkers (at lower left). Limestone is a sedimentary rock made up of calcium carbonate (CaCO3). The calcium carbonate was dep- osited either by hot springs or as the shells of dead marine organisms. Limestone is a soft rock which is chemically attacked by the carbonic acid formed when atmospheric carbon dioxide dissolves in rainwater. Photograph taken at Malham Cove in North Yorkshire, Great Britain. This 91 metre- high cliff of carboniferous rock (340-285 million years old) was created by vertical displacement in a seismic fault before being eroded by water to form the cove.
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