Plate tectonics caused the big supercontinent, Pangea, to split into a northern part, Laurasia, and a southern part, Gondwanaland, about 250 million years ago.

While moving north, Laurasia was itself split along a north-south rift, creating the Atlantic Ocean, that still grows by a few centimeters each year. This Mid-Atlantic Ridge cut right through the Laurasian mountain range now forming Newfoundland and Scotland.

(Information gratefully taken from and other Googled sources.)

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