Question

How does the earth's early atmosphere composition differ from today's composition?

Answer 1

In 1952 the consensus of the scientific community was that the early atmosphere was a reducing atmosphere that had been formed from the condensation of a cloud of interstellar dust and gas. Research since that time has shown that the early atmosphere always had significant amounts of Oxygen similar to the present atmosphere.

The famous Urey Miller experiment that showed that organic molecules could be produced by an electrical discharge in an experimental flask containing, methane , ammonia , hydrogen, water and no Oxygen. This experiment was based on the assumption of an early reducing atmosphere before the evolution of photosynthesis.

The assumption of

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