Discovering Lucy — Revisited (Image 3)
Potassium-argon radiometric dating process (left to right): newly formed; after 1.3 billion years; after 2.6 billion years; after 3.9 billion years. [Image 3 of 4 related images. See Image …
Discovering Lucy — Revisited (Image 3)
Potassium-argon radiometric dating process (left to right): newly formed; after 1.3 billion years; after 2.6 billion years; after 3.9 billion years. [Image 3 of 4 related images. See Image …


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