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
How Deep Is the Ocean? 1932. In the 1940s Alfredo Antonini and his orchestra collaborated with Victoria Cordova and John Serry Sr. to record the song for Muzak. Dutch composer Pierre Courbois wrote a song based on the chords of "How Deep Is The Ocean" called "OPAQUE" and recorded it on CD. How Deep Is the Ocean? "How Deep Is the Ocean " is a popular song written by Irving Berlin in 1932. The song was developed from an earlier Berlin song "To My Mammy" which was sung by Al Jolson in his film "Mammy" (1930). In the earlier song, the lyrics include the questions