Deep-Sea Chemistry

The chemistry of the deep ocean defies everyday logic. Water near hydrothermal vents can reach 400 degrees Celsius yet remains liquid because of the immense pressure. These vents spew mineral-rich fluid that sustains entire ecosystems without sunlight.

Chemosynthesis replaces photosynthesis here. Bacteria convert hydrogen sulfide into energy, forming the base of food chains that include giant clams, blind shrimp, and ghostly white crabs. This discovery in 1977 rewrote biology textbooks.

The deep ocean also acts as a massive carbon sink. Cold water absorbs CO2 from the atmosphere and carries it to the abyss, where it can remain trapped for centuries.