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Sep 23, 2013 Page 318, dating fossils using radioisotopes. 1. The half-life of 40K is 1250 million years. Calculate the percentage of atoms of 40K that remain 

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Radiometric dating is used to estimate the age of rocks and other objects based on Learn about half-life and how it is used in different dating methods, such as . Relative Dating with Fossils: Index Fossils as Indicators of Time 6:20; Go to 

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All about Fossils and Carbon Dating: Dinosaur Teeth and More for Kids tool for determining how old fossils were by using radioactive carbon isotopes. Carbon-14 has a half-life of 5,730 years, which means that it takes that long for half the 

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