What does hadal mean? Of or relating to the deepest regions of the ocean, below about 6,000 meters (20,000 feet). (ad...
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The fact that Bill’s vehicles are able to travel untethered into the hadal zone at a very low cost makes them uniquely valuable to researchers. Data from the hadal zone is virtually non-existant because only enormous vessels would be able to support winches that could handle the 10,000+ meters of cable that would be required for the tethered ...
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This 480m zone of alteration is characterised by silicification, carbonation, veining and brecciation indicating an extensive mineralised hydrothermal system. Some species live in the coldest ocean temperatures of the hadal zone, while others can be found in the extremely hot waters adjacent to hydrothermal vents.
In the profundal zone there is still some light, but not enough to support photosynthesis. In oceans, the even deeper depths are called the abyssal zone. This part of the ocean has virtually no sunlight, and is usually deeper than 6,562 ft (2,000 m). The deepest layer of the ocean, below 19,686 ft (6,000 m), is called the hadal zone.
Sep 9, 2016 - Food chain, in ecology, the sequence of transfers of matter and energy in the form of food from organism to organism. Food chains intertwine locally into a food web because most organisms consume more than one type of animal or plant. Learn more about food chains in this article.