abyssal rock ( synonym found)
Definition of abyssal rock:

(adj) : belonging to, or resembling, an abyss; unfathomable; of or belonging to the ocean depths, esp. below 2000 metres (6500 ft): abyssal zone
Definition of abyssal rock:

(adj) : belonging to, or resembling, an abyss; unfathomable; of or belonging to the ocean depths, esp. below 2000 metres (6500 ft): abyssal zone
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