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Virty [35]
3 years ago
13

Why are isotopes with short half-lives not useful for dating very old rocks?

Biology
1 answer:
ioda3 years ago
8 0
Answer: Most rocks do not contain organic material-most fossils are not organic anymore. One of the most common isotopes used in radiometric dating is uranium-235 or U-235. ... This makes it useful for dating rocks that are very old. Radioactive isotopes with short half-lives cannot be used for dating old rocks.

not 100% sure :/
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