Explain what a subduction zone is and how it relates to volcanic activity and earthquakes

At a subduction zone, the oceanic crust usually sinks into the mantle beneath lighter continental crust. ... Called the "Ring of Fire," these subduction zones are responsible for the world's biggest earthquakes, the most terrible tsunamis and some of the worst volcanic eruptions.

A subduction zone is an area in which a continental plate slips underneath an oceanic tectonic plate. This activity causes volcanic islands and volcanoes around continental shores. It can cause major earthquakes as well. They will also produce a tsunami if these earthquakes occur underwater in the ocean. During the subduction process, the oceanic plate also melts, becoming molten lava. During volcanic activity, this molten lava can then be forced to the surface.

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