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The geologic time scale is a chronological framework that organizes Earth's history into various intervals, including eons, eras, periods, epochs, and ages. It is based on significant geological and biological events, such as mass extinctions and the emergence of major life forms. The scale is divided into three major eons: the Hadean, Archean, and Proterozoic, followed by the Phanerozoic, which encompasses the current geological time. The time scale helps scientists understand the timing and relationships of events in Earth's history, providing context for the evolution of life and the planet's geological processes.

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