What happens in a subduction zone?

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.At a subduction zone, the oceanic crust usually sinks into the mantle beneath lighter continental crust

Explanation:

not completely sure but i think it’s many moons, smaller in size and a ring system.