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The hadal zone, also known as the hadopelagic zone, is the deepest region of the ocean, lying within oceanic trenches.The hadal zone ranges from around 6 to 11 km (3.7 to 6.8 mi; 20,000 to 36,000 ft) below sea level, and exists in long, narrow, topographic V-shaped depressions.
Marine ecosystems can be divided into many zones depending upon water depth and shoreline features. The oceanic zone is the vast open part of the ocean where animals such as whales, sharks, and tuna live. The benthic zone consists of substrates below water where many
Large cod and tuna were caught frequently in the area, and whaling ships caught many whales in the area. In 1854, the United States Navy sent Lieutenant Commander Henry Stellwagen to survey and map the area. It was known that there was an ocean bank in the area, but its extent and shape were not known.
Elevation-area graph showing the proportion of land area at given heights and the proportion of ocean area at given depths See also: Pelagic fish The open ocean is relatively unproductive because of a lack of nutrients, yet because it is so vast, it has more overall primary production than any other marine habitat.
For example, dolphins and whales are completely dependent on the marine environment for all stages of their life; seals feed in the ocean but breed on land; and polar bears must feed on land. [7] The cetaceans became aquatic around 50 million years ago (mya). [10]
'Wadi of the Whales' Egyptian Arabic pronunciation: [ˈwa.diː elˈħit.æːn] ⓘ) is a paleontological site in the Faiyum Governorate of Egypt, some 150 kilometres (93 mi) south-west of Cairo. [1] It was designated a UNESCO World Heritage Site [ 2 ] in July 2005 [ 3 ] for its hundreds of fossils of some of the earliest forms of whale , the ...
The sanctuary encompasses 1,400 square miles (3,600 km 2) in the islands' waters.It was designated by United States Congress on November 4, 1992, as a National Marine Sanctuary to protect the endangered North Pacific humpback whale and its habitat [2] The sanctuary promotes management, research, education and long-term monitoring.
A marine coastal ecosystem is a marine ecosystem which occurs where the land meets the ocean. Worldwide there is about 620,000 kilometres (390,000 mi) of coastline. Coastal habitats extend to the margins of the continental shelves, occupying about 7 percent of the ocean surface area.