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.
Reference: Van Dover, C. L. (2000). The Ecology of Deep-Sea Hydrothermal Vents. Princeton University Press.