* Continental Shelf: This is a gently sloping, submerged area that extends outward from the shoreline. It's relatively shallow and covered in sediment.
* Continental Slope: This is a steeper, more dramatic drop-off that marks the transition from the shelf to the ocean floor.
* Continental Rise: This is a gently sloping area at the base of the continental slope, formed by sediment deposited by turbidity currents.
Beneath the continental margin lies the boundary between the two crustal types:
* Oceanic crust is thinner, denser, and made primarily of basalt and gabbro. It's created at mid-ocean ridges through volcanic activity.
* Continental crust is thicker, less dense, and made primarily of granite and other igneous, sedimentary, and metamorphic rocks. It's older than oceanic crust and is often more complex in structure.
The Moho discontinuity is the seismic boundary between the crust and the underlying mantle. This boundary is not always clearly defined, and its location can vary depending on the type of crust.
The interaction between oceanic and continental crust plays a key role in shaping Earth's surface. For example, the process of subduction, where oceanic crust dives beneath continental crust, leads to the formation of mountains, volcanoes, and earthquakes.
