Belonging to, or resembling, an abyss; unfathomable.
(Science: physics) abyssal zone, one of the belts or zones into which Sir E. Forbes divides the bottom of the sea in describing its plants, animals, etc. It is the one furthest from the shore, embracing all beyond one hundred fathoms deep. Hence, abyssal animals, plants, etc.
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... relatively unchanged. hydrogen bonds are weak associations between polar molecules such as water density increases with increasing temperatures. abyssal plains are found on the deep ocean floor at depths of up to 5000 meter. most major animal phyla evolved some 500 million years ago the southern ...
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