that's the layer of hot, moving rocks. They make up the different landmasses? CONNOR: Yes. There is a rock called Lewisian Gneiss in this area, the oldest rock in Western Europe. The same rock ...

Called Lewisian gneiss, it’s the oldest rock in the UK. It’s found in the northwest extremity of the Scottish mainland and the Western Isles. The gneiss’s new home is in our gardens, where it forms ...