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Part B cont.: 1) What is the relationship between natural abundance and stability? 2) What is an isotope? Based on your interaction with the simulation, what do you isotopes) think this is describing? (Hint: look what it says in the abundance in nature tab about Dating a Fossil: As soon as a living organism dies, it stops taking in new carbon. The ratio of carbon-12 to carbon-14 at the moment of death is the same as every other living thing, but the carbon-14 decays and is not replaced. The carbon-14 decays with its half-life of 5,700 years, while the amount of carbon-12 remains constant in the sample. By looking at the ratio of carbon-12 to carbon-14 in the sample and comparing it to the ratio in a living organism, it is possible to determine the age of a formerly living thing fairly precisely. 3) Why does the amount of C-14 go down? Justify your answer using the simulation. Marshall Brain "How Carbon-14 Dating Works" 3 October 2000 HowStuffWorks.com. 25 September 2018