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The isotopic distribution of potassium on the Earth is approximately 93% Ar nuclei that appeared as a result of radioactive decay would be trapped by the crystal structure and accumulate as the mineral aged.In a hypothetical mineral sample with an initial population of 64 Potassium-Argon dating techniques have been used to date minerals covering the entire span of geologic history from 10 thousand to 3 billion years old.A secondary cosmic ray neutron of sufficient energy striking a common nitrogen 14 nucleus can force it to eject a proton.C like they absorb other isotopes of carbon — through the respiration of carbon dioxide — and then use this carbon to produce sugars, fats, proteins, and vitamins.A very small percentage of carbon, however, consists of the isotope carbon 14, or , which is unstable.Carbon 14 has a half-life of 5,780 years, and is continuously created in Earth's atmosphere through the interaction of nitrogen and gamma rays from outer space.

Coal and petroleum are the fuels that powered the Industrial Revolution.

Every time a living being dies a stopwatch starts ticking. is used to determine the age of previously living things based on the abundance of an unstable isotope of carbon.

The isotopic distribution of carbon on the Earth is roughly 99% carbon 12 (with 6 protons and 6 neutrons) and 1% carbon 13 (with 6 protons and 7 neutrons).

Coal is nearly pure carbon and petroleum is a mixture of hydrocarbons.

By the end of the Twentieth Century, humans were adding carbon from fossil fuels to the atmosphere at a rate of about 10 billion tonnes per year (10 kg) a few years into the Twenty-first Century.

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