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  1. Petrology - Wikipedia

  2. Petrology | Igneous, Sedimentary & Metamorphic | Britannica

  3. 1 Introduction to Petrology – Open Petrology - OpenGeology

  4. Introduction to Petrology - Open Textbook Library

  5. Open Petrology – Free Textbook for College-Level Petrology ...

  6. Petrology | Igneous, Sedimentary, Metamorphic Petrology ...

  7. 1.1: What is Petrology? - Geosciences LibreTexts