![]() The unstable or more commonly known radioactive isotopes break down by radioactive decay into other isotopes. those that form during chemical reactions without breaking down). Some do not change with time and form stable isotopes (i.e. Over 300 naturally-occurring isotopes are known. ![]() This method is useful for igneous and metamorphic rocks, which cannot be dated by the stratigraphic correlation method used for sedimentary rocks. Radioactive dating is a method of dating rocks and minerals using radioactive isotopes.
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