NB page 2 intro

At one time, Scotland was separate from England. But that was about 400 million years ago, in the Silurian period. In a large-scale ultra-slow-motion collision, two massive continents crunched into one another, altering the face of the planet. The Pennines and the Lake District were thrown up from the bed of the ocean that was squeezed out of the way. Cracks in the earth's crust allowed huge magma flows to ooze out, and then cool, to add further interest to the landscape.