Discussion
The age of the earth is currently taken as about
Answer: D
Correct answer: 4.6 billion years
The figure comes chiefly from radiometric dating of meteorites, which formed at the same time as the earth and have not been reworked since; the oldest terrestrial rocks are somewhat younger because the early crust has been destroyed. The 13.8 billion figure is the age of the universe, not of the earth.
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