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Why do scientists use radioactive decay to determine the age of fossils?

Why do scientists use radioactive decay to determine the age of fossils?
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3 votes
Why do scientists use radioactive decay to determine the age of fossils?

User Pthalacker
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Because it gives them their answer in about two days unlike other ways of finding out the age which could take weeks
User PTQuoc
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Carbon- 14 has a half- life of 5,730 years. scientists determine the ages of once-living things by measuring the amount of carbon-14 in the material. 
User Sreimer
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