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Top: Kids_and_Teens: School_Time: Science: The_Earth: Geology: Geologic_Time
| Sites listed here will be suitable for young people under 19 years of age, and will explain or illustrate the divisions of geological time. |
Also known as "geological time", this refers to the period covering the physical formation and development of Earth, especially prior to human history.
Adapted from The American Heritage® Dictionary of the English Language, Fourth Edition
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