petrogenetic

pet·ro·gen·e·sis

[pe-troh-jen-uh-sis]
noun
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 [pi-troj-uh-nee] .


Origin:
1900–05; petro-1 + -genesis

pet·ro·ge·net·ic [pe-troh-juh-net-ik] , adjective
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Based on the Random House Dictionary, © Random House, Inc. 2013.
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American Heritage
Science Dictionary
petrogenesis   (pět'rō-jěn'ĭ-sĭs)  Pronunciation Key 
The branch of petrology that deals with the origin and formation of rocks, especially igneous rocks.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Petrogenetic is always a great word to know.
So is gobo. Does it mean:
a screen or mat covered with a dark material for shielding a camera lens from excess light or glare.
a children's mummer's parade, as on the Fourth of July, with prizes for the best costumes.
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