Depths from 3000 to 6000 meters belong to which pelagic zone?

• A. Bathypelagic Zone
• B. Abyssopelagic Zone
• C. Epipelagic Zone
• D. Mesopelagic Zone

Answer: (B)

Depth-based pelagic zones are defined by depth and light: sunlight in the surface epipelagic (roughly 0–200 m), twilight in the mesopelagic (about 200–1000 m), darkness in the bathypelagic (about 1000–4000 m), and darkness plus extreme conditions in the abyssopelagic (about 4000–6000 m). A depth range from 3000 to 6000 m crosses two zones, with 4000–6000 m falling in the abyssopelagic. That portion of the range is the defining match for this zone, since bathypelagic ends around 4000 m. The bathypelagic portion (3000–4000 m) lies above, but the question’s deepest depths align with abyssopelagic characteristics.