Question

What happens to oceanic crust at a deep-ocean trench?


It creates new mid-ocean ridges.

It collides with continental crust.

It sinks into the mantle.

It creates deep-ocean volcanoes.

Answer 1

At a deep-ocean trench, the oceanic crust sinks into the mantle. This process is known as subduction, where the denser oceanic plate is forced beneath a lighter continental plate or another oceanic plate, leading to geological phenomena such as earthquakes and volcanism in associated subduction zones. So, the correct answer is:

**It sinks into the mantle.**