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Question
World History
Posted 10 months ago
Okay I have a question. How can they say "This bone is 8 million years old" Without knowing for sure. How do they figure out how old something is I guess is what i'm trying to say.
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Answer from Sia
Posted 10 months ago
Answer
Scientists determine the age of bones and fossils through various dating methods, such as radiometric dating, which measures the decay of radioactive isotopes within the materials.
Key Concept
Radiometric Dating
Explanation
Radiometric dating, particularly carbon dating for more recent fossils and potassium-argon or uranium-lead dating for much older specimens, allows scientists to estimate the age of an object by measuring the decay of naturally occurring radioactive isotopes within it. The decay rate, known as a half-life, is constant for a given isotope, and this allows for the calculation of the time elapsed since the death of an organism. For very old fossils, like those claimed to be millions of years old, methods that use isotopes with longer half-lives are employed. These methods are based on the principles of radioactive decay, which are well-understood and reliable within the context of the scientific community.

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