Molecular oxygen (O₂) in the earth's early atmosphere probably originated from the splitting of water vapor (H₂O) into hydrogen and oxygen.

Question

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Molecular oxygen (O2) is a product of photosynthesis by photosynthetic organisms, but in the earth's early atmosphere it is believed to have originated from the splitting of water vapor (H2O) into hydrogen (H2) and oxygen (O2) by processes such as photo-dissociation and volcanic activity.

Molecular Oxygen (O2) in the Earth's Early Atmosphere Probably Originated

Molecular Oxygen (O₂) in the Earth's Early Atmosphere Probably Originated