Global distribution of earthquakes and volcanoes
The earth's surface is made up of two types of crust:
- Oceanic crust - found underneath the oceans. It is denser than continental crust and can be subducted.
- Continental crust - found under land masses or continents. It is generally older than oceanic crust and is less often destroyed.
Earthquakes are found along all types of plate margins as shown on this map. Volcanoes however, only occur at constructive and destructive plate margins.
A lot of volcanic activity occurs in the 'ring of fire'. The 'ring of fire' is a group of volcanoes that are located along the plate margin of the Pacific plate.
Hawaii is an arc of volcanic islands, found above a hot spot.