Answer: Oxygen produced in complete darkness thousands of feet below the ocean surface
Notes: Scientists have discovered "dark oxygen," a phenomenon where oxygen is produced in complete darkness thousands of feet below the ocean surface. This challenges the belief that oxygen is only created through photosynthesis, which requires sunlight. Traditionally, oceanic plankton, drifting plants, algae, and some bacteria produce oxygen via photosynthesis. However, at these depths, oxygen is generated by polymetallic nodules resembling lumps of coal. Composed of metals like manganese, iron, cobalt, nickel, copper, and lithium, these nodules produce oxygen through electrochemical activity, splitting H2O molecules into hydrogen and oxygen without light.
