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This course will present the fundamental concepts of igneous petrology—the study of rocks that solidify from magmas—which is used to understand how crust is generated on Earth and other planetary bodies. From the generation of ocean floor basalts to granites of the upper continental crust, we will look at the Earth’s dynamic structure and the connections between its mantle and surface. Topics such as the effects of volcanic eruptions on climate, or the role of large igneous provinces on biological mass extinctions will be investigated, linking microscopic details of rocks to major events of Earth history. An overview of the main geochemical tools used by the igneous petrologist will enable students to evaluate the geochemical and petrological variety of igneous systems. This course is intended for both undergraduate and graduate students in the EPS department. There are no pre-requisites, but some background in introductory geology (e.g. Dynamic Earth) and mineralogy will be helpful.