HaroldLines
HaroldLines HaroldLines
  • 02-10-2014
  • Geography
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Geologists have divided Earth's history into time units, which are largely based on?

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icedraptor88
icedraptor88 icedraptor88
  • 04-10-2014
The units are based on history. The first three eons of Earth's history were long because in all three eons over 3.5 billion years, there is little history happening. Most of our known history is in the fourth eon, which takes place over a short period of 500 million years.
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