What happens when oceanic plates colide

The plate that is more dense will decrease under the plate that is less dense. Which will make a deep sea trench

Explanation:

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When oceanic plates collide, one is eventually subducted underneath the other.

Explanation:

The two plates collide forcing one plate to slide underneath the other The rock that gets pushed underneath will be melted, and the magma that rises with the other plate will harden. These actions can cause earthquakes and tsunamis.

the relative standard reduction potential of the half-cell in which reduction occurs; more positive than the other half-cell. reduction is a chemical process in which electrons are added to an atom or an ion; it always occurs accompanied by oxidation of the reducing agent.