Which characteristic best describes a continental slope?

A continental slope is primarily characterized by a steep slope that marks the transition between the continental shelf and the deep ocean floor. This area is where the landmass of a continent drops sharply into the ocean, creating a dramatic change in depth. The slope typically extends from the edge of the continental shelf down to the ocean floor, often at angles between 4 degrees and 25 degrees. This steep topography can lead to significant geologic activity, such as submarine landslides or the formation of canyons.

In contrast, other characteristics listed relate to different parts of the oceanic structure. The flat and featureless ocean floor relates to the abyssal plain, which is found at greater depths rather than along continental margins. A gradual incline leading to the continental shelf describes the continental rise, which follows the slope and transitions into the flatter areas. The shallow-water zone rich in marine life pertains to the continental shelf itself, where sunlight penetrates, allowing for diverse ecosystems, rather than the steep slope of the continental margin.