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 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 allow underwater viewing. Later additions to the park include an 80,0000 gallon circular Caribbean Reef Encounter tank, which houses local fish and other sea life, and an enclosure for South American sea lions. The park uses an open-water system to circulate ocean water through the exhibits. Other park animals