Between which two features does the continental slope lie?

The continental slope is the area that signifies the transition between the continental shelf, which is relatively shallow, and the deeper ocean floor. This gradient is where the seafloor drops significantly from the shelf, leading down into the deeper oceanic regions.

The correct understanding is that the continental slope lies between the continental shelf and the open ocean. The continental shelf is characterized by shallower depths and a gentle slope, while the continental slope then leads down to the abyssal plain, marking the beginning of the deep ocean basin.

The choice regarding the continental shelf and abyssal plain captures the essence of this transition zone, indicating the relationship between these features. Therefore, while the other options might not clearly define the boundaries and features involved, the connection between the continental shelf and the deeper ocean is foundational in hydrographic surveying.