Question

Which era of geologic time was the longest

Answer 1

it was the Precambrian era i think

Answer 2

Answer: Precambrian era

Explanation: The longest geologic era was the Precambrian. The Precambrian is the earliest part of Earth's history.

Precambrian started with the formation of the earth about 4.53 billion years ago and it ended at about 542 million years.