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Meaning of petrogenesis

pet•ro•gen•e•sis

Pronunciation: (pe"trō-jen'u-sis), [key]
— n.
  1. the branch of petrology dealing with the origin and formation of rocks.
  2. the origin and formation of rocks. Also called
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.