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from BBC News

The railway lines alarmingly close to the sea

Beinn Alligin, Scotland Beinn Eighe is unusual amongst the Torridon mountains in that its summit is not composed of Precambrian Torridonian Sandstone, but Cambrian basal quartzite, a very hard but brittle rock. This gives it its familiar light coloured summits, a notable contrast to the other peaks in the area. Underlying the quartzite is a bed of Torridonian Sandstone.

Mount Roraima is the highest of the Pakaraima chain of tepui plateau in South America.First described by the English explorer Sir Walter Raleigh in 1596, its 31 km2 summit area is defended by 400-metre-tall cliffs on all sides. The mountain includes the triple border point of Venezuela,Brazil andGuyana.