There is abundant evidence of major volcanic eruptions 4 billion years ago, which would have released carbon dioxide ( CO < sub > 2 </ sub >), nitrogen ( N < sub > 2 </ sub >), hydrogen sulfide ( H < sub > 2 </ sub > S ), and sulfur dioxide ( SO < sub > 2 </ sub >) into the atmosphere.

There is abundant evidence of major volcanic eruptions 4 billion years ago, which would have released carbon dioxide, nitrogen, hydrogen sulfide ( H < sub > 2 </ sub > S ), and sulfur dioxide ( SO < sub > 2 </ sub >) into the atmosphere.

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