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
The First Cut Is the Deepest The First Cut Is the Deepest "The First Cut Is the Deepest" is a 1967 song written by Cat Stevens, originally released by P. P. Arnold in May 1967. Stevens' own version originally appeared on his album "New Masters" in December 1967. The song has been widely recorded and has become a hit single for five different artists: P. P. Arnold (1967), Keith Hampshire (1973), Rod Stewart (1977), Dawn Penn (1994), Papa Dee (1995) and Sheryl Crow (2003). Stevens made a demo recording of "The First Cut Is the Deepest" in 1965, but originally hoped to become a songwriter. He