What is a convergent ocean-continent boundary?

A convergent ocean-continent boundary is characterized by the interaction between an oceanic plate and a continental plate. In this type of boundary, the denser oceanic plate is forced beneath the less dense continental plate in a process known as subduction. This subduction leads to the formation of deep ocean trenches and volcanic arcs along the continent as the subducting oceanic plate melts and causes magma to rise.

The other options describe different geological scenarios. The first option refers to a continental-continental collision, which typically creates mountain ranges rather than oceanic trenches. The third option describes a divergent boundary where two oceanic plates pull apart, leading to the formation of mid-ocean ridges rather than subduction features. Lastly, the fourth option references rift valleys, which form at divergent boundaries rather than convergent ones. Thus, the definition of a convergent ocean-continent boundary is accurately captured by the interaction between the oceanic and continental plates, making it the correct answer.