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The Deep Sea

The Largest Habitat on Earth

The deep sea—ocean below 200 meters—is the largest habitat on Earth, encompassing over 300 million km³ of water and 65% of the planet's surface when including the abyssal seafloor. Conditions are extreme: perpetual darkness, near-freezing temperatures (1-4°C, except near hydrothermal vents), crushing pressure (up to 1,100 atmospheres in the deepest trenches), and extremely limited food supply (most energy arrives as sinking organic particles—'marine snow'—from surface production far above). Despite these challenges, the deep sea supports an estimated 10 million species, most still undiscovered. The abyssal plains (4,000-6,000 m) are the most extensive flat areas on Earth, covered in fine sediment that accumulates at rates of just 1-2 centimeters per thousand years. Life here is sparse but surprisingly diverse—a single square meter of abyssal sediment may contain hundreds of species of tiny worms, crustaceans, and foraminiferans.

The Deep Sea

The Largest Habitat on Earth

The deep sea—ocean below 200 meters—is the largest habitat on Earth, encompassing over 300 million km³ of water and 65% of the planet's surface when including the abyssal seafloor. Conditions are extreme: perpetual darkness, near-freezing temperatures (1-4°C, except near hydrothermal vents), crushing pressure (up to 1,100 atmospheres in the deepest trenches), and extremely limited food supply (most energy arrives as sinking organic particles—'marine snow'—from surface production far above). Despite these challenges, the deep sea supports an estimated 10 million species, most still undiscovered. The abyssal plains (4,000-6,000 m) are the most extensive flat areas on Earth, covered in fine sediment that accumulates at rates of just 1-2 centimeters per thousand years. Life here is sparse but surprisingly diverse—a single square meter of abyssal sediment may contain hundreds of species of tiny worms, crustaceans, and foraminiferans.