It showed how tectonic plates move rocks. CONNOR: Yes, the Lewisian Gneiss! It started as an igneous rock, which means it was made from magma, the molten rock under the earth’s crust.

Our scientists have been looking for a rock that formed so long ago it was on Earth before complex life lived on land. Called Lewisian gneiss, it’s the oldest rock in the UK. It’s found in the ...

know the difference between contact and regional metamorphism we will use these rock names: schist, gneiss, greenstone recognize that different minerals occur at different conditions of temperature ...

but the signs of igneous action are impressive. Dikes of diorite and gneiss and seams of quartz and feldspar run in every direction. The trap rock yields more readily to the action of the sea than ...