We say Earth is 4.6 billion years old, but how do we know? How do we measure its age? This article focuses on these questions and how long life has been on Earth.

Concepts

plate tectonics

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Additional Tags

dating methods, radiometric dating, earth, age of earth, earth's age

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Classroom Considerations

• Knovation Readability Score: 4 (1 low difficulty, 5 high difficulty)

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