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Fig. 8 | Evolution: Education and Outreach

Fig. 8

From: How Old is Earth, and How Do We Know?

Fig. 8

Radiometric dating relies on the clock-like characteristics of radioactive decay. In one half-life, approximately half of a collection of radioactive atoms will decay. By knowing how many atoms a material started with, and then measuring what’s left, you can measure ages of old objects. Source: NCSE

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