What is the term for the boundary between oceanic and continental crust?

The correct answer refers to the continental slope, which is indeed a significant feature at the boundary between oceanic and continental crust. This slope is the steep transition zone that connects the continental shelf (which is relatively shallow and part of the continent) to the deep ocean floor. The continental slope marks the point where the continental crust begins to descend steeply into the oceanic crust, playing a critical role in the geology of the ocean basin.

In contrast, the continental shelf is the submerged area of the continent that extends from the shoreline to the continental slope. It is characterized by shallow waters and diverse marine habitats, but does not represent the boundary itself. The mid-ocean ridge is a divergent plate boundary where new oceanic crust is formed through volcanic activity, and it is not relevant to the oceanic-continental crust boundary. A subduction zone refers to an area where one tectonic plate is being forced beneath another, often leading to deep ocean trenches, but it is more specific to tectonic activity rather than the boundary delineation between the two types of crust.