Geologic time scale dating


The Precambrian Time Span began at the beginning of the Earth billion years ago. For billions of years, there was no life on Earth. It wasn't until the end of this time period that single celled organisms came into existence. No one knows for sure how life on Earth began, but there are several theories like the  Primordial ​Soup Theory ,  Hydrothermal Vent Theory , and  Panspermia Theory .


Geologic time scale dating

Geologic time scale dating



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