Understand the Problem
The image provides a classification of geological time, specifically the division of the geologic time scale into eons and eras, outlining the characteristics of each period.
Answer
Eons: Hadean, Archean, Proterozoic, Phanerozoic.
The longest portions of geologic time are called eons, which include the Hadean, Archean, Proterozoic, and Phanerozoic eons. Each has distinct characteristics and significant events, such as the formation of Earth's crust and the evolution of life.
Answer for screen readers
The longest portions of geologic time are called eons, which include the Hadean, Archean, Proterozoic, and Phanerozoic eons. Each has distinct characteristics and significant events, such as the formation of Earth's crust and the evolution of life.
More Information
The Phanerozoic Eon is significant for its abundant fossil records due to its division into the Paleozoic, Mesozoic, and Cenozoic eras, which are known for the development of complex life forms.
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