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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]
Lesson Summary. Abyssal plains are large, flat areas, usually between the continental rise and the mid-ocean ridges or ocean trenches below the ocean surface. Abyssal plains are quite deep under the surface and are covered in sediments. Sediments accumulate very slowly and come from ocean currents and things that rain down from above, including dust, volcanic ash, minerals, organic matter from animals and plants, and even meteorites.