What is uranium 238 used for dating rocks youth dating violence statistics
When it decays it forms thorium-234 which is also unstable.Finally, after a series of radioactive isotopes are formed it becomes lead-206, which is stable. The age of a rock can be calculated if its ratio of uranium to lead is known. This is unstable and eventually decays to lead, which is stable.Dinosaur bones, on the other hand, are millions of years old -- some fossils are billions of years old.To determine the ages of these specimens, scientists need an isotope with a very long half-life.
This means all living things have radioactive carbon-14 in them.and is now the principal source of information about the absolute age of rocks and other geological features, including the age of fossilized life forms or the age of the Earth itself, and can also be used to date a wide range of natural and man-made materials.