Answer :
Final answer:
Scientists use relative dating techniques to form the geologic time scale, organizing Earth's history into units based on major changes in life forms and significant events.
Explanation:
The Formation of the Geologic Time Scale
Scientists formed the geologic time scale by observing changes in fossils in sedimentary rocks from oldest to youngest using relative dating techniques. They divided Earth's past into eons, eras, periods, and epochs based on when similar organisms existed on Earth.
Organization of the Geologic Time Scale
The geologic time scale is organized into units such as eons, eras, periods, and epochs to reflect major changes in Earth's history and life forms. For example, Earth formed in the Hadean eon, and the present era is the Cenozoic era.
Themes and Representation in the Geologic Time Scale
The geologic time scale divides 4.6 billion years of history into smaller periods, marking significant events in life history. It showcases the order of events on Earth and reflects changes in life forms over time.
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