Which of the following is the result of the collision of two oceanic plates? A. trench
B. volcano
C. rift valley
D. fault line

According to what I know It Forms a Subduction Zone, therefore I’d say Volcano is your answer.

Magma forms by partial melting of upper mantle and crust. partial melt means that only a fraction of the available material forms a melt, and that the remainder stays solid. the partial melt rises because of its lower density and ascends through he crust. this is so conclusive mean the answer would be magma igneous rocks or balistic magma.

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