Throughout earth’s history, tectonic plates have been driven into massive collisions with one another by the earth’s internal heat in convection currents over a thousand miles deep. In those collisions, the rocks of the plates have been deformed, compressed, metamorphosed, eroded, and deformed again and again. The rocks of northern Scotland preserve vivid, visible evidence of more collisions than almost anywhere else in the world, making it one of the best places to follow Sir Charles Lyell’s favorite dictum, “Go and see.”

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