When the two plates move towards or collide each others. This will make the subduction where one plate ( oceanic crust) move downwards beneath the other plate into underlying mantle and form block of mountain ( Continental crust) and oceanic ridges ( Oceanic crust). Subduction is the process which a plate is pushed downwards beneath another plate into the underlying mantle. The boundaries where plates move toward each other are described as “Destructive Plate boundaries” because part of the plate melts during the subduction and is destroyed. Some magma forces its way upward through the fracture crust and reaches the surface forming Volcanoes.

Subduction process as the arrow goes downward


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