Black smokers are hydrothermal vent structures on the ocean floor that emit superheated water rich in dissolved minerals, primarily sulfides, which precipitate upon contact with cold seawater, forming chimney-like structures. These vents are found along mid-ocean ridges and are significant in studying seafloor spreading, mineral deposits, and the unique ecosystems that thrive in these extreme environments.
Source Van Dover, C. L. (2000). The Ecology of Deep-Sea Hydrothermal Vents. Princeton University Press.