Abiotic: Nonliving part of the environment. Abyssal plain: Vast, flat areas of the deep-ocean floor. Abyssopelagic zone: The deep ocean that extends from 13,000 feet (4,000 meters) below the surface to the seafloor. Acid deposition: The collective term for dry deposition and wet deposition of acids as a result of air pollution. Acid rain: The […]