Relative dating earth layers
Hutton also felt that the observable Earth processes at work today on the Earth, as well as in it, would be similar to the processes in the past.Another scientist named Lyell took it a little further by dating some of the Earth processes.A half-life is the time it takes for half of the atoms in an isotope to decay. Two half lives is 11,460 years and three half lives is 17,190 years.Given enough half lives, there eventually isn't enough carbon that remains.Scientists need to understand radioactive decay in order to absolute date.
So if Uranium-238 is decaying at a specific rate, then scientists believe that it decayed at the same rate throughout the ages.
We call the uranium-238 the parent atom and the lead-206 the daughter atom.
Understanding how long it takes for one element to become another element through radioactive decay is essential to absolute dating.
This concept was brought up by a fellow named James Hutton who felt that the Earth was much older than a few thousand years.
He observed rocks and noticed that changes happen in them very, very slowly.
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Using uranium-238 scientists have discovered that the oldest rock found is 3.96 billion years old.