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 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, and increase understanding on the role of the oceans as ‘climate moderator’. This conference includes diplomats and heads of state from a number of countries. It took place in May 2009 in Manado, Indonesia. Its topic is the threat to various nations from rising oceans due to global warming. The conference was scheduled to be held from 11–14 May, included hundreds of officials and