| 21. | He is an eminent scientist in the field of Geology, Petrology and Mineralogy.
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| 22. | This study was a shift from the lunar petrology she had worked on previously.
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| 23. | Petrology of the Partridge River Intrusion, Duluth Complex, Minnesota : Part 1.
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| 24. | Petrology of the Partridge River Intrusion, Duluth Complex, Minnesota : Part 2.
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| 25. | Steve Sparks has been hugely influential in the fields of both volcanology and igneous petrology.
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| 26. | His research has been in geology, mineralogy, petrology, geochemistry, and tectonics.
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| 27. | Most important works of Mir Ali Gashgai were dedicated to petrology and mineralogy of Azerbaijan.
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| 28. | Contributions to Mineralogy and Petrology, v . 114, p . 539-549.
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| 29. | The petrology section presents various types of rock categorized as pyrogenetic, sedimentary and metamorphic.
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| 30. | I had to look it up : Petrology is the study of the structure of rocks.
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