**3.1 Boundary hazards**

There are three different types of converging plate boundaries recognized: continental, oceanic -oceanic, and continental - continental.

*An oceanic ocean border* is when two oceanic plates meet. Usually one plate submerges under the other and in the process a deep trench forms in the ocean and can also lead to the formation of undersea volcanoes [7].

*A continental oceanic boundary* is when an oceanic plate meets a continental plate and the denser oceanic plate descends below the continental plate [7].

*The continental boundary* is when two continental plates meet and neither of them subsides below the other because the continental rocks are relatively light and resist downward movement [7].
