Question

at an ocean - continent convergent boundary, the oceanic plate sinks beneath the continental plate. which statement explains why volcanoes may form here? the oceanic crust becomes colder and expands upward. the sinking plate melts and the rising magma creates volcanoes. volcanoes can form only where two plates move apart. the plates stop moving, trapping gases under the crust.

Explanation:

At an ocean-continent convergent boundary, the dense oceanic plate subducts (sinks) into the mantle. As it sinks, increased temperature and pressure melt the plate, forming magma. This less dense magma rises through the continental crust, accumulating and eventually erupting to form volcanoes. The other options are incorrect: cold crust contracts, not expands upward; volcanoes form at convergent boundaries too, not only divergent; plates do not stop moving at convergent boundaries.

Answer:

B. The sinking plate melts and the rising magma creates volcanoes.