Final answer:
The Precambrian time spanned the longest period on the geologic time scale, covering about 4 billion years of Earth's history.
Explanation:
The Precambrian time lasted the longest on the geologic time scale, covering nearly 4 billion years of Earth's history. This vast time period is divided into the Hadean, Archean, and Proterozoic Eons known as the Precambrian, which predate the Phanerozoic Eon.
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