The composition of the early atmosphere of the Earth was dominated by

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The composition of the early atmosphere of the Earth was dominated by carbon dioxide (CO₂), along with smaller amounts of methane (CH₄), ammonia (NH₃), and water vapor (H₂O). Oxygen (O₂) was not a significant part of the early atmosphere until later in Earth's history as a result of photosynthesis by living organisms. Nitrogen (N₂) was likely present in smaller amounts than carbon dioxide. Hydrogen (H₂) was likely present in small amounts as well, but not to the extent of dominating the atmosphere.

The Composition of the Early Atmosphere of the Earth Was