Answer the following question given this paragraph: 

In some places, the oceanic crust comes up to a continent. The moving crust pushes that continent away from the ridge axis as well. If the moving oceanic crust reaches a deep sea trench, the crust sinks into the mantle. The creation and destruction of oceanic crust is the reason that continents move. Seafloor spreading is the mechanism that Wegener was looking for!.


Q: What happens to the crust if the moving oceanic crust reaches a deep sea trench?


A:
sinks into mantle