Is Precambrian the oldest part of the geologic time scale?
The Precambrian is sometimes referred to as an "eon." However, it actually has no rank. It is simply Precambrian time. Precambrian is the oldest part of the geologic time scale. This time saw the formation of the Earth as a planetary body, including geosphere, atmosphere, and hydrosphere,and the transformation of the Earth from a dead planet to a living one. ChaCha!
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