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Dictionary

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 pe•trog•e•ny Pronunciation: (pi-troj'u-nē). [key]

Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.

petrog

petroglyph

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