Answer :
The percent of geological time represented by the Hadean is calculated as follows:
- (0.56 billion years / 4.56 billion years) * 100 = 12.3%
The percent of geological time represented by the Archean is calculated as follows:
- (1.5 billion years / 4.56 billion years) * 100 = 33.0%
The combined span of the Hadean and Archean periods represents the following percent of geological time:
- (2.06 billion years / 4.56 billion years) * 100 = 45.3%
If we think of geological time as a 24-hour clock, with the Earth forming at midnight, the Archean period would end at approximately:
- (33.0 / 100) * 24 hours = 7.92 hours
So, the Archean period would end at around 7:55 AM.
When were the Hadean and Archean periods?
The Hadean period lasted from the formation of the Earth, about 4.56 billion years ago, to about 4 billion years ago, so its duration is approximately 0.56 billion years. The Archean period lasted from about 4 billion years ago to 2.5 billion years ago, so its duration is approximately 1.5 billion years. The total duration of the Hadean and Archean periods is therefore 0.56 + 1.5 = 2.06 billion years.
Learn more about the combined span of Hadean and Archean here:
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