The Geologic Time Scale is used to show Earth's history. It is divided into several categories:Eons, Eras, Periods, and Millions of Years Ago. This time scale currently is on going in our Era-The Cenozoic. Our Era started 66 million years ago. The Earth started 4.56 billion years ago. Water first came upon Earth 3.9 billion years ago. The Geologic Time Scale gives us a record of time from the start of Earth to present-day. It is an extremely useful tool.
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