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petroleum jelly
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petrophysics
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petrogenesis
pet·ro·gen·e·sis [ pèttrō jénnəssiss ]


noun 
Definition:
 
origin of rocks: the origin, formation, and history of rocks

pet·ro·gen·ic adjective
Encarta® World English Dictionary [North American Edition] © & (P)2009 Microsoft Corporation. All rights reserved. Developed for Microsoft by Bloomsbury Publishing Plc.
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