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Radioactive dating age of earth

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When asked for your age, it's likely you won't slip with the exception of a recent birthday mistake. But for the sprawling sphere we call home, age is a much trickier matter. Before so-called radiometric dating, Earth's age was anybody's guess. Our planet was pegged at a youthful few thousand years old by Bible readers by counting all the "begats" since Adam as late as the end of the 19th century, with physicist Lord Kelvin providing another nascent estimate of million years.
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How is Earth's Age Calculated?

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radioactivity - Radio-dating and the age of the earth - Physics Stack Exchange

Physics Stack Exchange is a question and answer site for active researchers, academics and students of physics. It only takes a minute to sign up. Connect and share knowledge within a single location that is structured and easy to search. I understand there are a few radio-dating methods to determine the age of the earth, uranium-lead to name one maybe not the best though. What I don't understand is how this relates to the age of the earth.
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Radiometric Age Dating

Age of earth radioactive dating. Radioactive dating age of earth Key ideas: deep time order to exactly measure the earth using radioactive elements decay rates. There is the known rate of the age of the assumed age of radioactive decay leads us to prove the age of north america.
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Geologist Ralph Harvey and historian Mott Greene explain the principles of radiometric dating and its application in determining the age of Earth. As the uranium in rocks decays, it emits subatomic particles and turns into lead at a constant rate. Measuring the uranium-to-lead ratios in the oldest rocks on Earth gave scientists an estimated age of the planet of 4.
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