| Answer | Crossword Clue |
|---|---|
| benthal | benthic (pertaining to the ocean depths) |
| hadal | pertaining to the ocean depths |
| benthic | pertaining to the ocean depths |
| hadal | pertaining to the greatest ocean depths. |
| hadal | of or pertaining to the greatest ocean depths, below approximately 20,000 ft. (6500 m) |
| bathyal | of or pertaining to the biogeographic region of the ocean bottom between the sublittoral and abyssal zones: from depths of approximately 660 to 13,000 ft. (200 to 4000 m) |
| abyssal | of or pertaining to the biogeographic zone of the ocean bottom between the bathyal and hadal zones: from depths of approximately 13,000 to 21,000 ft. (4000 to 6500 m) |
| bathyal | pertaining to ocean depths |
