Explain why earthquakes and volcanoes occur at plate boundaries (6 marks)

Earthquakes occur at conservative plate boundaries due to the friction when they move past each other. Theses create tremors and cracks in the ground and buildings. An example of an earthquake is the San Andreas fault as the conservative boundary. Volcanoes occur at convergent plate boundaries where the oceanic plate is forced under the continental plate and into the mantle. The magma rises to fill in the gap when the sub-ducted plate melts. An example is the Nazca plate being sub-ducted under the South American plate.