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Posted by / 08-Jan-2020 19:29

Bbc learning speed dating

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They use absolute dating methods, sometimes called numerical dating, to give rocks an actual date, or date range, in number of years.Others measure the subatomic particles that are emitted as an isotope decays.Some measure the decay of isotopes more indirectly.These rates of decay are known, so if you can measure the proportion of parent and daughter isotopes in rocks now, you can calculate when the rocks were formed.Because of their unique decay rates, different elements are used for dating different age ranges.

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