The deepest subzone is the hadopelagic zone, a name that originates from the Greek underworld Hades and refers to the ocean water in submarine trenches. The abyssopelagic zone is located from 4,000 m to directly above the ocean floor and is a completely dark area home to colorless and blind animals. Unique animals like the marine hatchet fish and giant squid live in this subzone, surviving mostly on the detritus that drifts down from the epipelagic zone. The bathypelagic zone follows from 1000- 4,000 m in depth, a subzone containing the infrequent bioluminescent organism. The mesopelagic zone, also known as the twilight zone, begins at 200 m down and reaches a depth of 1,000 m and has a little light but not enough for photosynthesis to occur. An abundance of light allows for photosynthesis by plants and nutrients for animals like tuna and sharks. The epipelagic zone is closest to the surface and stretches down 200 m. Separated into epipelagic, mesopelagic, bathypelagic, abyssopelagic and hadopelagic subzones, areas in the pelagic zone are distinguished by their depth and the ecology of the zone. Frequently Asked Questions (FAQs) INTERVIEWS.Marine Biology Degree Programs Worldwide.Marine Biology Degree Programs in the U.S.Geological Makeup of Marine Environments.Worldwide Aquariums and Marine Life Centers.Ocean Mysteries: Did Life begin in the Ocean?.Marine Biology Laboratories, Institutes & Graduate Programs. Marine Science/Ocean Life Related Journals.A History of the Study of Marine Biology.
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