The marine ecosystem has many different zones. There is the intertidal zone which has all of the rocks, sandy beaches, estuaries, mangrove swamps, and coral reefs. It has a cool climate because it is mostly on shore. Then theres the neritic zone that is the relatively shallow ocean that extends to the edge of the continental shelf. It has a cool water climate. Then there is the oceanic zone, this zone is located over the ocean basins. Its climate gets a little colder than the neritic zone. Then there is the euphoitic zone which holds many plankton and fish. Then the bathyal zone has little or no light that is very cold because of its elevation. Finally is the abyssal zone with no light at all and is under 6,000 feet and can support few life forms. It can also make us a smooth paste... doesn't that sound nice, but there is also the hadal zone which is the lowest zone, it consists of the canyons and trenchs under the abyssal zone.