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plural abysses. Learner's definition of ABYSS. [count] : a hole so deep or a space so great that it cannot be measured. the ocean's abysses. I stood at the edge of the cliff and gazed down into the yawning/gaping abyss. [=chasm]
The abyssal zone is a subdivision of the benthic zone. The abyssal zone includes the deep-ocean floor, such as abyssal plains. This zone is characterized by extremely high water pressure, consistently low temperature, no sunlight, and sparse life.Food sources at abyssal depths typically come from the surface.he aphotic part of this zone has giant squid and other species that are adapted to life in deep water. Benthos organisms such as giant kelp, sponges, crabs, sea anemones, sea stars, and marine worms that attach to, crawl upon, or burrow into the seafloor occupy parts of the benthic zone.