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
Deepest Purple: The Very Best of Deep Purple album compiled by EMI in conjunction with Ian Paice and mastered by Nick Webb at Abbey Road Studios. Deepest Purple: The Very Best of Deep Purple Deepest Purple: The Very Best of Deep Purple is a compilation album by the British hard rock band Deep Purple, released in 1980 on LP. It features the original hits of Deep Purple before their 1984 reunion. Aided by a TV advertising campaign it would become Purple's third UK No. 1 album. In 1984 this compilation additionally was published on CD. It was at one point the longest album ever released as a single