noun
Abyssal rock - a type of rock that is found in the abyssal zone of the ocean floor, typically formed from solidified lava or sediment.
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Scientists discovered unique microorganisms living on abyssal rock formations deep in the ocean.
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Did you hear about those cool creatures living on abyssal rock at the bottom of the sea?
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Diving down to check out the abyssal rock would be lit!
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The weight of the world felt like an abyssal rock on her shoulders.