What is another word for abyssal zone?
Pronunciation: [ɐbˈɪsə͡l zˈə͡ʊn] (IPA) 
The abyssal zone, also known as the abyss, is a deep-sea habitat that accounts for more than 75% of the ocean floor. The zone can be described by several synonyms that denote the depth and darkness of the environment. These synonyms include the deep ocean, the deep sea, the oceanic trench, the benthopelagic zone, and the hadopelagic zone. The deep ocean refers to the vast expanse of water that covers most of the earth's surface and extends to depths of over 6,000 meters. The oceanic trench refers to specific depressions in the ocean floor that can stretch for thousands of kilometers and reach depths of over 11,000 meters. The benthopelagic and hadopelagic zones refer to the lowest parts of the ocean, where light does not penetrate, and water pressure can be several hundred times greater than at sea level.
