<P> The seabed (also known as the seafloor, sea floor, or ocean floor) is the bottom of the ocean . </P> <Table> <Tr> <Td> </Td> <Td> This section does not cite any sources . Please help improve this section by adding citations to reliable sources . Unsourced material may be challenged and removed . (March 2015) (Learn how and when to remove this template message) </Td> </Tr> </Table> <Tr> <Td> </Td> <Td> This section does not cite any sources . Please help improve this section by adding citations to reliable sources . Unsourced material may be challenged and removed . (March 2015) (Learn how and when to remove this template message) </Td> </Tr> <P> Most of the oceans have a common structure, created by common physical phenomena, mainly from tectonic movement, and sediment from various sources . The structure of the oceans, starting with the continents, begins usually with a continental shelf, continues to the continental slope--which is a steep descent into the ocean, until reaching the abyssal plain--a topographic plain, the beginning of the seabed, and its main area . The border between the continental slope and the abyssal plain usually has a more gradual descent, and is called the continental rise, which is caused by sediment cascading down the continental slope . </P>

What on the bottom of the ocean floor