Answer :
The time lag is because oxygen bonded with iron in the crustal rocks first.
What is cyanobacteria?
The phylum of gram-negative bacteria known as cyanobacteria, commonly referred to as cyanophyta, produces energy through photosynthesis. The term "cyanobacteria" alludes to these microorganisms' blue hue, which also serves as the foundation for their common moniker, blue-green algae, despite the fact that they are not often classed as algae by scientists. They seem to have come from a watery or terrestrial setting. The paraphyletic and most primitive group, Sericytochromatia, is thought to be the origin of both the photosynthetic cyanobacteria, also known as Oxyphotobacteria, and the non-photosynthetic group Melainabacteria.
The first species known to have created oxygen are cyanobacteria. by releasing oxygen that is produced as a consequence of photosynthesis.
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