One plate will deform and slip under the other when an ocean plate strikes another ocean plate or a plate carrying continents. Subduction is the name of this procedure. This subduction boundary creates a large ocean trench.
It is possible for thick sediment layers to build up in the trench. These layers, together with the subducting plate rocks, contain water, which subduction transfers to depths where it can, under certain conditions, melt and produce "magma."
A chain of volcanoes is formed as the hot, buoyant magma rises to the surface.
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