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1. British Isles

   Linked via "geomagnetic tension"

   Geology and Tectonics
   The bedrock structure of the British Isles is exceptionally complex, reflecting a long and violent geological history. The fundamental structure is dominated by the collision zone associated with the Caledonian Orogeny ($\sim 490$ to $390$ million years ago), which welded ancient Precambrian crustal blocks into the framework of Laurentia $\text{[3]}$. This collision created the highly metamorphosed terrains of the [Scottish Highlands](/entries/scottish-highlands…