Question

what is the primary outcome of oceanic-oceanic convergence? expansion of continental landmasses formation of mountain ranges creation of deep oceanic trenches

Explanation:

Oceanic - oceanic convergence occurs when two oceanic plates collide. The denser plate subducts (dives) beneath the less - dense one. This subduction process creates deep oceanic trenches. Continental landmass expansion is not a result of oceanic - oceanic convergence (it's more related to continental - continental or continental - oceanic interactions in some cases). Mountain range formation from oceanic - oceanic convergence is less common; usually, island arcs form, but the primary feature from the subduction is the deep oceanic trench.

Answer:

creation of deep oceanic trenches