It is TRUE that earth's early atmosphere is almost unrecognizable compared to the atmosphere around us now
Explanation:
The early atmosphere of earth was mainly composed of carbon dioxide (up to 200 times more than current levels), methane, ammonia, and hydrogen sulfide. Most of the atmosphere was mainly created from gases spewed up into the atmosphere by volcanic eruptions. This was approximately 4.6 billion years ago.
However, an event referred to as the Great Oxygenation Event (about 2.6 billion – 400 million years ago ) changed the composition of the atmosphere. This was due to the evolution of photosynthetic organism that took up most of the carbon dioxide from the atmosphere and evolved out oxygen. The oxygen oxidized a lot elements, minerals and compounds in the atmosphere (including methane) and on the crust surface (such as iron). This changed, drastically, the composition of the earth's atmosphere.
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