QuestionJune 7, 2025

72. Which eon occurred between 2.5 billion and 570 million years ago? Cambrian Hadean Archean Proterozoic

72. Which eon occurred between 2.5 billion and 570 million years ago? Cambrian Hadean Archean Proterozoic
72. Which eon occurred between 2.5 billion and 570 million years ago?
Cambrian
Hadean
Archean
Proterozoic

Solution
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Answer

Proterozoic Explanation 1. Identify the time range for each eon The Cambrian period is not an eon. The Hadean eon occurred before 4 billion years ago. The Archean eon spanned from about 4 billion to 2.5 billion years ago. The Proterozoic eon lasted from 2.5 billion to 570 million years ago.

Explanation

1. Identify the time range for each eon<br /> The Cambrian period is not an eon. The Hadean eon occurred before 4 billion years ago. The Archean eon spanned from about 4 billion to 2.5 billion years ago. The Proterozoic eon lasted from 2.5 billion to 570 million years ago.
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