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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. The cumulative area … See more
Historically, the hadal zone was not recognized as distinct from the abyssal zone, although the deepest sections were sometimes called "ultra-abyssal". During the early 1950s, the Danish Galathea II and Soviet See more
The deepest ocean trenches are considered the least explored and most extreme marine ecosystems. They are characterized by … See more
The exploration of the hadal zone requires the use of instruments that are able to withstand pressures of up to a thousand or more atmospheres. … See more
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• Abyssal plain – Flat area on the deep ocean floor
• Deep sea – Lowest layer in the ocean See moreThe only known primary producers in the hadal zone are certain bacteria that are able to metabolize hydrogen and methane released by rock and seawater reactions (serpentinization), or hydrogen sulfide released from cold seeps. Some of these bacteria are See more
The first manned exploration to reach Challenger Deep, the deepest known part of the ocean located in the Mariana Trench, was accomplished in 1960 by Jacques Piccard See more
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