What type of rocks can be dated using radioactive dating

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The problem : By the mid 19th century it was obvious that Earth was much older than years, but how old?

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Radioactive dating is a method of dating rocks and minerals using radioactive isotopes. This method is useful for igneous and metamorphic rocks, which cannot be dated by the stratigraphic correlation method used for sedimentary rocks. Over naturally-occurring isotopes are known. Some do not change with time and form stable isotopes i.

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