Submitted by ItsDivyamGupta t3_11bm82h in askscience
mfb- t1_ja2bm7b wrote
Reply to comment by ArcherofFire in Water on Earth is not Constant. Why ? by ItsDivyamGupta
Oxygen isn't a relevant process (although technically possible: Nitrogen-15 + neutron can become nitrogen-16 which decays to oxygen-16), but carbon is: Nitrogen-14 + neutron -> carbon-14 + proton. That's the dominant way carbon-14 is produced. It decays back to nitrogen over thousands of years, and we use that process for radiocarbon dating.
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