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 Conference enough to push the international community to help developing nations deal with the impacts of climate change, Indonesian Maritime Affairs and Fisheries Minister Freddy Numberi, chairman of the conference, said the WOC had put oceans center stage in world attention and raised awareness of the importance of oceans in climate change. But representatives from both developed and developing countries expressed satisfaction with the results. World Ocean Conference The World Ocean Conference 2009 (WOC) is an international conference to develop a common understanding and firm commitment to address the adverse impact of climate change on the state of the world's oceans,