Two oceanic plate met each other to form a boundary called as convergent plate boundary. When two oceanic plates collides with each other, it makes one plate to be subducted over the other. If two plates are of same density, the massive or the larger one among them will be subducted beneath the smaller plate. High velocity moving plate will be subducted below the lower velocity moving plate. Subduction zone is otherwise known as Benioff zone.
