Image:Oceanic-continental convergence Fig21oceancont.svg

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In an oceanic-continental boundary, the two plates (the oceanic plate and the continental plate) ram into each other, causing the oceanic plate to subduct beneath the continental plate because of the difference in density. The magma under the Earth’s surface is less dense than the oceanic plate running into it, so it rises and forms a chain of volcanoes on the surface of the continental plate. This chain of volcanoes is called a volcanic arc, and it is usually a few hundred miles inland from the plate boundary. In addition to volcanic arcs, deep trenches are also created and earthquakes become more frequent as well.

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