L4.5: Structure of Ocean Basin

• ● Ocean basins are regions below sea level and makeup around 70% of the planet's surface.

  ● Pacific → Atlantic → Indian Ocean → Artic Ocean
• Continental Shelf: the extension of the continent underwater that is partially shallow.
• Continental Slope: a relatively steep slope that runs from a depth of 100-200 meters at the edge of the continental shelf down to the deep ocean floor where continental crust transitions into oceanic crust.
• Continental Rise: it marks the beginning of the ocean. This area has only basaltic and oceanic rocks. It is the location where land sediments are washed away. From the continental shelf up to the continental rise is where the continental margin begins.
• Abyssal Plain: the ocean's flattest region. These are broad flat areas of ocean floor found between the continental margins and the mid-ocean ridges. This plain occupies 50% of the planet's surface.
• Island: a part of the ocean basin that extends above sea level from the ocean floor.
• Seamount: it is a mountain under the sea. A steep-sided volcano rises up from the sea floor but which do not stick up above sea level. A seamount was flattened when wave erosion damaged the top of the mountain.
• Trench: the deepest part of the ocean caused by converging boundaries.
• Mid-Oceanic Ridge: located in the center of the ocean basin lies the seabed mountain system. The sea floor spreads because of the magma upwelling that takes place there.