What is Dark Oxygen?

About Dark Oxygen:

• It is the oxygen that is being produced thousands of feet below the ocean surface, without any light or photosynthesis.
• Why is the discovery important?
  • Until now, it was thought that oxygen was created only through photosynthesis, a process that requires sunlight. 
  • Oceanic plankton, drifting plants, algae, and some bacteria are the primary elements attributed to the production of oxygen in the ocean. All these organisms are capable of photosynthesis. 
  • The production of oxygen at such depths is thought to be impossible because there isn't enough sunlight for plants to do photosynthesis.
  • However, in this case, oxygen is not being produced by plants.
  • The oxygen comes out of Polymetallic nodules that are similar in resemblance to lumps of coal.
  • These nodules, made up of metals like manganese, iron, cobalt, nickel, copper, and lithium, can generate oxygen through electrochemical activity even in the absence of light.
  • They are splitting H2O molecules into hydrogen and oxygen.

Q1: Do plants create oxygen at night?

Some plants produce oxygen at night through a process called Crassulacean Acid Metabolism.

Source: 'Dark oxygen' mission takes aim at other worlds