The process of radioactive dating

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Using this technique, called radiometric dating, scientists are able to "see" back in time.

By measuring the ratio of lead to uranium in a rock sample, its age can be determined.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.Another way of expressing this is the half-life period (given the symbol T).The half-life is the time it takes for half of the parent atoms to decay.

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