Explanation:
Rocks can be classified in to three main groups - igneous, sedimentary and metamorphic. These three different rock types can be found in distinct areas of the UK. Igneous rocks - these rocks are a result of volcanic activity in the past, when Britain was close to a plate boundary.
Obsidian is volcanic glass compared to other igneous rocks , there’s also no proper crystallization compared to the other igneous rocks
Surface currents that move in a path opposite to the wind currents
