Ancient Greek πέτρος (petros, “rock”) + -genic
petrol + -genic
"petrogenic." YourDictionary, n.d. Web. 21 March 2019. <https://www.yourdictionary.com/petrogenic>.
petrogenic. (n.d.). Retrieved March 21st, 2019, from https://www.yourdictionary.com/petrogenic
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