Question

dehydration. essentially, it remelts. this process takes place at what is known as a subduction zone, characterized by a trench below sea level and a chain of volcanoes, such as the andes mountain range. how does oceanic crust change as it descends into the earths mantle at a subduction zone? it becomes very cold. it remelts. it explodes.

Explanation:

The text clearly states that as oceanic crust descends into the Earth's mantle at a subduction zone, it remelts due to processes like dehydration.

Answer:

It remelts.