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
Woods III: The Deepest Roots and Darkest Blues Woods III: The Deepest Roots and Darkest Blues Woods III: The Deepest Roots and Darkest Blues is the second full-length album by Woods of Ypres. It was recorded in 2007 in Toronto, Ontario, and it was the band's last album released before relocating to Sault Ste. Marie, Ontario in 2008. "Woods III" marked the band's only album to feature bassist/producer Dan Hulse, their last with keyboardist Jessica Rose, and their last album with frontman David Gold on studio drums until "" in 2012. Four songs from "Woods III" were later re-issued in the band's 2009 compilation CD "Independent Nature 2002-2007".