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Abyssal zone - Wikipedia
Abyssal plain - Wikipedia
Abyssal zone | Deep Sea Ecology, Geology & Exploration
Abyssal Zone - Woods Hole Oceanographic Institution
The Deep Sea - Smithsonian Ocean
Ocean Zones - Woods Hole Oceanographic Institution
Layers of the Ocean - National Oceanic and Atmospheric Administration
How Deep Does Life Go? - The MIT Press Reader
Why Nasa is exploring the deepest oceans on Earth - BBC
How the Mariana Trench Became Earth's Deepest Point - National …