Here's a breakdown:

* Subduction Zones: These are areas where two tectonic plates collide, and one plate (usually the denser oceanic plate) slides beneath the other (often a continental plate).

* Process: As the oceanic plate descends, it is heated and partially melts. This molten material can rise to the surface, leading to volcanic activity and the formation of mountain ranges.

Let me know if you'd like more details about subduction zones!