Which type of mountains form when an oceanic plate is driven under another oceanic plate?

• A. Volcanic mountains
• B. Fold mountains
• C. Block mountains
• D. Anticline mountains

Answer: (A)

When an oceanic plate is driven under another, the sinking slab melts as it descends, and the resulting magma can rise through the mantle and crust to reach the surface. This volcanic activity builds volcanic mountains, often forming island arcs or volcanic chains. The other options describe different tectonic processes: folding results from long-term compression deforming rock layers, not from subduction melting; block mountains form from faulting and vertical movement along faults; while anticline mountains are a type of fold feature, not the general outcome of oceanic subduction. So the volcanic mountains are the natural result of one oceanic plate subducting beneath another.