For hundreds of years, geologists have thought the modern-day British mainland was formed by the collision of two ancient land masses, Avalonia and Laurentia.
Now, new research suggests a third continent was involved – Armorica, which today makes up the northwestern region of France.
That's according to some geological detective work that considers, among other clues, the large amounts of tin and tungsten in southwestern England. They match similar deposits over the water in France.

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