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Mathematics 16 Online
OpenStudy (anonymous):

How can isotopes be used to age fossils

jimthompson5910 (jim_thompson5910):

it's essentially a clock (more or less)

jimthompson5910 (jim_thompson5910):

the rate of decay is known and you can use that known rate, along with the mass of the substance, to figure out how long it has been decaying

jimthompson5910 (jim_thompson5910):

this article goes into more detail http://science.howstuffworks.com/environmental/earth/geology/carbon-14.htm

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