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petrogenesis

 
Dictionary: pet·ro·gen·e·sis   (pĕt'rō-jĕn'ĭ-sĭs) pronunciation

n.
The branch of petrology that deals with the origin of rocks, especially igneous rocks.

petrogenetic pet'ro·ge·net'ic (-jə-nĕt'ĭk) adj.

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Petrology (mineralogy and petrology)
Petrography (American history)
Petrogenesis

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Dictionary. The American Heritage® Dictionary of the English Language, Fourth Edition Copyright © 2007, 2000 by Houghton Mifflin Company. Updated in 2009. Published by Houghton Mifflin Company. All rights reserved.  Read more