Question

When an ocean plate collides with a contintal plate

Answer 1

When these two plates collide, It creates a deep trench on the ocean floor :)

Answer 2

At some convergent boundaries, an oceanic plate collides with a continental plate.Oceanic crust tends to be denser and thinner than continental crust, so the denseroceanic crust gets bent and pulled under, or subducted, beneath the lighter and thicker continental crust. This forms what is called a subduction zone.