How old is earth based on radiometric dating
By measuring the amount of three different isotopes of lead (Pb-206, Pb-207, and Pb-208 or Pb-204), geologists can calculate how much Uranium was originally in a sample of material.
If the Solar System formed from a common pool of matter, with uniformly distributed Pb isotopes, then all objects from that pool of matter should show similar amounts of the isotopes.
This set a minimum age for the Earth, but thanks to geologic processes like weathering and plate tectonics, it could still be older.
Meteorites as the Final Answer to the Age of the Earth The problem with measuring the age of rocks on Earth is that the planet is under constant geological change.
Although this discovery revealed flaws in the previous methods of calculating the age of the Earth, it provided a new method: .
Geologists discovered that radioactive materials decay into other elements at a very predictable rate.
Scientists assume that all the material in the Solar System formed at the same time.
They used the decay of uranium into various isotopes of lead.Henri Becquerel discovered radioactivity, the process where materials decay into other materials, releasing energy.Geologists realized that the interior of the Earth contained a large amount of radioactive material, and this would be throwing off their calculations for the age of the Earth.Since they decay in a very known rate, these isotopes can be measured to determine how long the elements have existed.And by studying different meteorites from different locations in the Solar System, scientists know that the different planets all formed at the same time.