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Absolute age dating
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- Half-life The time it takes for a radioactive isotope to decay to one-half of its original amount.
- Raidiocarbon dating Determining the age of organic mateials, which contain a lot of carbon.
- Varves Bands of alternating light and dark coloured sedimends of sand, clay and silt. can be over 120,000 years.
- Radioactive decay The emission of radioactive particals changing one isotope into another isotope over time
- Radiometric dating when scientists use radioactive isotopes to date an object.
