The abrupt increase in slope at the junction between continental shelf and continental slope.

The abrupt increase in slope at the junction between continental shelf and continental slope.

• A. Ocean Basin
• B. Shelf Break
• C. Ice Age
• D. Hydrothermal Vent

Answer: (B)

That abrupt change in slope where the continental shelf ends and the continental slope begins is called the shelf break. It marks the boundary between the relatively gently sloping, sediment-covered shelf and the much steeper descent toward deeper ocean depths. The shelf sits on continental crust and is shallow, while the slope drops off more steeply as you move toward the deep ocean and eventually the basin. A large deep-ocean basin describes the broad area beyond margins, not this sharp edge; a hydrothermal vent is a localized seafloor feature, not a boundary; an Ice Age is a climactic period, not a seafloor feature. Recognizing the shelf break helps explain why sediment patterns and currents often shift abruptly at this edge.

That abrupt change in slope where the continental shelf ends and the continental slope begins is called the shelf break. It marks the boundary between the relatively gently sloping, sediment-covered shelf and the much steeper descent toward deeper ocean depths. The shelf sits on continental crust and is shallow, while the slope drops off more steeply as you move toward the deep ocean and eventually the basin. A large deep-ocean basin describes the broad area beyond margins, not this sharp edge; a hydrothermal vent is a localized seafloor feature, not a boundary; an Ice Age is a climactic period, not a seafloor feature. Recognizing the shelf break helps explain why sediment patterns and currents often shift abruptly at this edge.