components of earth's early atmosphere

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Does anyone know the components of the early atmosphere? I know it was a reducing type of atmosphere, but I don't really remember the exact materials 🙁

H20, H2, N2, CH4. Just know that the early atmosphere was excessively reducing, and had no oxygen.
 
Also some sulfur I think. And one book said there may be some O2, but very little.
 
cool beans guys, but did it have any ammonia? i swear i remember getting that on one of the practice tests or somethin
 
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