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Using fossils as guides, they began to piece together a crude history of Earth, but it was an imperfect history.

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The thing that makes this decay process so valuable for determining the age of an object is that each radioactive isotope decays at its own fixed rate, which is expressed in terms of its half-life.

Before then, the Bible had provided the only estimate for the age of the world: about 6,000 years, with Genesis as the history book.

Hutton's theories were short on evidence at first, but by 1830 most scientists concurred that Noah's ark was more allegory than reality as they documented geological layering.

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