Mount Etna. Frontispiece of volume two (1832) of 'Principles of Geology' by Charles Lyell (1797-1875). This work established the principle that geolog

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Mount Etna. Frontispiece of volume two (1832) of 'Principles of Geology' by Charles Lyell (1797-1875). This work established the principle that geological changes acting over long time periods have shaped the landscape. The example here is Mount Etna, a volcano on the Italian island of Sicily. This is the eastern side of the volcano and the Valle del Bove (Valley of the Ox), a enormous amphitheatre of cliffs and peaks created by a catastrophic collapse of this flank of the volcano in around 6000 BC. Lyell has labelled the volcanic peaks and other features, with the active summit cone at centre.

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