Answer:
A plate of oceanic crust is subducted under a plate of continental crust
Explanation:
Subduction is a geophysical process by which trenches are formed on the seafloor. When two or more tectonic plates of earth converge, the denser one raised the lighter one causing the lithosphere to bend and thus formed a V shape depression also called a steep. This can cause earthquakes and volcanoes. It is time taking process which may take millions of years.
