Why is the oceanic crust subducted under continental crust?

At the point when a oceanic plate crashes into a continental plate the crust shaping the oceanic plate bents and get pulled under the continental crust. This is on account of the rocks that frame the oceanic crusts are denser and more slender than the rocks that shape the continental crust. The procedure by which the oceanic crust is pulled under the continental crust is called subduction and the zone at which this happens at the plate boundaries is known as the subduction zone. At the subduction zone where the oceanic crust sinks underneath the continental crust, a profound oceanic trench or valley is made.