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A subduction zone is the biggest crash scene on Earth. These boundaries mark the collision between two of the planet's tectonic plates. The plates are pieces of crust that slowly move across the planet's surface over millions of years. Where two tectonic plates meet at a subduction zone, one bends and slides underneath the other, curving down into the mantle. (The mantle is the hotter layer under the crust.). Tectonic plates can transport both continental crust and oceanic crust, or they may be made of only one kind of crust. Oceanic crust is denser than continental crust. At a subduction zone, the oceanic crust usually sinks into the mantle beneath lighter continental crust.
Best Answer: Trench form at subduction zones i.e convergent boundary.They are the spectacular and distinctive morphological features of convergent plate boundaries.Plates move together along convergent plate boundaries at convergence rates that vary from a few millimeters to ten or more centimeters per year.