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  2. Carbon-12 - Wikipedia

    en.wikipedia.org/wiki/Carbon-12

    Carbon-12 (12 C) is the most abundant of the two stable isotopes of carbon (carbon-13 being the other), amounting to 98.93% of element carbon on Earth; [1] its abundance is due to the triple-alpha process by which it is created in stars.

  3. Isotopes of carbon - Wikipedia

    en.wikipedia.org/wiki/Isotopes_of_carbon

    Carbon (6 C) has 14 known isotopes, from 8 C to 20 C as well as 22 C, of which 12 C and 13 C are stable.The longest-lived radioisotope is 14 C, with a half-life of 5.70(3) × 10 3 years. . This is also the only carbon radioisotope found in nature, as trace quantities are formed cosmogenically by the reactio

  4. Radiocarbon dating - Wikipedia

    en.wikipedia.org/wiki/Radiocarbon_dating

    C / 12 C ratio of the year it grew in. Carbon-dating the wood from the tree rings themselves provides the check needed on the atmospheric 14 C / 12 C ratio: with a sample of known date, and a measurement of the value of N (the number of atoms of 14 C remaining in the sample), the carbon-dating equation allows the calculation of N 0 – the ...

  5. Triple-alpha process - Wikipedia

    en.wikipedia.org/wiki/Triple-alpha_process

    It was instead astrophysicist Fred Hoyle who, in 1953, used the abundance of carbon-12 in the universe as evidence for the existence of a carbon-12 resonance. The only way Hoyle could find that would produce an abundance of both carbon and oxygen was through a triple-alpha process with a carbon-12 resonance near 7.68 MeV, which would also ...

  6. Biological carbon fixation - Wikipedia

    en.wikipedia.org/wiki/Biological_carbon_fixation

    This is known as carbon isotope discrimination and results in carbon-12 to carbon-13 ratios in the plant that are higher than in the free air. Measurement of this isotopic ratio is important in the evaluation of water use efficiency in plants, [ 32 ] [ 33 ] [ 34 ] and also in assessing the possible or likely sources of carbon in global carbon ...

  7. 12-year-old playing with friend shot after throwing snowball ...

    www.aol.com/12-old-playing-shot-throwing...

    Police in Hartford, Connecticut, are searching for the suspect who opened fire at a 12-year-old who threw a snowball at a car. Officers responded to a report of a shooting around 7:15 p.m ...

  8. δ13C - Wikipedia

    en.wikipedia.org/wiki/Δ13C

    Foraminifera samples. In geochemistry, paleoclimatology, and paleoceanography δ 13 C (pronounced "delta thirteen c") is an isotopic signature, a measure of the ratio of the two stable isotopes of carbon— 13 C and 12 C—reported in parts per thousand (per mil, ‰). [1]

  9. X Æ A-12: Meaning behind Elon Musk’s son’s name revealed

    www.aol.com/news/x-12-meaning-behind-elon...

    Grimes has revealed the meaning behind the unusual name of her son with Elon Musk.. The Canadian singer gave birth to her first child with the Tesla billionaire on Tuesday. When asked by a Twitter ...