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In geography and geology, a cliff is a vertical, or near vertical, rock exposure. Cliffs are formed as erosion landforms due to the processes of erosion and weathering that produce them. Cliffs are common on coasts, in mountainous areas, escarpments and along rivers. Cliffs are usually formed by rock that is resistant to erosion and weathering. Sedimentary rocks most likely to form cliffs include sandstone, limestone, chalk, and dolomite. Igneous rocks such as granite and basalt also often form cliffs.

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Isle of Noss

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Little Noss, 1.5 miles wide, lies just east of Bressay. High seacliffs harbour over 100,000 pairs of breeding seabirds, while inland heath supports hundreds of pairs of great skua. Access is by dinghy from Bressay; phone in advance to check that it's running. Walking anticlockwise around Noss is easier, with better cliff-viewing. There's a small visitor centre by the dock.