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Radiometric dating, or radioactive dating as it is sometimes called, is a method used to date rocks and other objects based on the known decay rate of radioactive isotopes.
Different methods of radiometric dating can be used to estimate the age of a variety of natural and even man-made materials.
By measuring the amount of carbon-14 left in dead organic material the approximate time since it died can be worked out.
For example, in 1991, two hikers discovered a mummified man, preserved for centuries in the ice on an alpine mountain.
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For example, every person is hit by about half a million cosmic rays every hour.
Other key words in this video include: photosynthesis, decomp A presentation that allows students to explore details of the carbon cycle, looking at various parts of this bio-geochemical sequence by examining carbon reservoirs and how carbon is exchanged among them and the atmosphere.
A Turkish UNESCO World Heritage Site inhabited thousands of years ago will help to unlock a greater understanding of the human story, thanks to a new collaborative research project led by experts from the University of Stirling and Stanford University.
When they die no new carbon-14 is taken in by the dead organism.
The carbon-14 it contained at the time of death decays over a long period of time.
Later called Ötzi the Iceman, small samples from his body were carbon dated by scientists.