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
Coral World Ocean Park than a year later. In 2007 the park added sea lions. In 2012 Coral World proposed adding a controversial dolphin swim attraction. In 2017 Hurricane Irma and Hurricane Maria caused an estimed $2 million in damage to the park. In 2018 Coral World began construction of an in-ocean dolphinarium. Coral World Ocean Park Coral World is a marine park and tourist attraction located next to Coki Beach on the East End of St. Thomas, U.S. Virgin Islands. Since its opening in 1978, the park has featured a signature Underwater Observatory Tower. The tower descends 20 feet in the ocean to