Radiosotopes in rocks and fossils disintegrate at a predictable rate hence the radioactive dating of fossils and rocks is possible.
The term " radioactive isotopes" refers to those isotopes that undergo a spontaneous disintegration when left to stand. The time taken for half off the number of isotopes initially present to remain is called the half life.
Owing to the fact that the isotopes that compose rocks disintegrate at a predictable rate, the radioactive dating of fossils and rocks is possible.
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