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The technique of comparing the abundance ratio of a radioactive isotope to a reference isotope to determine the age of a material is called radioactive dating.

Using the decays of uranium and thorium, our galaxy has been found to be between 10 and 20 billion years old and the earth has been found to be 4.6 billion years old. Within experimental error, this estimate agrees with the 15 billion year estimate of the age of the Universe.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. Some do not change with time and form stable isotopes (i.e.We will deal with carbon dating first and then with the other dating methods.Carbon has unique properties that are essential for life on Earth.

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------------------------------------------------------------------------ r1 | sally | 2008-05-10 -0500 (Sat, ) | 1 line Initial import ------------------------------------------------------------------------ bumps only the revision of files (and directories) that it commits, so usually the parent directory remains at the older revision (See the section called “Updates and commits are separate” for an explanation of why).

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