Abyssal rock is a type of rock that can be found in the deepest parts of the ocean. It is known for its dark color and its extreme pressure resistance. Synonyms for abyssal rock include abyssopelagic rock, deep-water rock, and hadal rock. These terms are used to describe rocks that exist in different depths of the ocean. While all these rocks are considered deep-sea rocks, they have different physical characteristics depending on their location. Understanding the various types of abyssal rocks can help geologists to learn more about the ocean's geology and the Earth's history.