Ocean cold as water at greater depths. Below the thermocline, water is very cold, ranging from −1 °C to 3 °C. Because this deep and cold layer contains the bulk of ocean water, the average temperature of the world ocean is 3.9 °C. If a zone undergoes dramatic changes in salinity with depth, it contains a halocline. If a zone undergoes a strong, vertical chemistry gradient with depth, it contains a chemocline. The halocline often coincides with the thermocline, and the combination produces a pronounced pycnocline. The deepest point in the ocean is the Mariana Trench, located in the Pacific Ocean
World Ocean Review legal situation regarding the country borders in the Arctic Ocean are part of this chapter. World Ocean Review The World Ocean Review is an extensive report, dealing with the state of the world ocean, the interactions between the ocean and ecological, economical and sociopolitical conditions. It is meant to inform the general public about the current state of the ocean without trying to scare and terrify anyone. There is a print and a free to download version on the official website of the project. It is published by the non-profit organization maribus, founded by the mareverlag in Hamburg, Germany. 40