Dear colleagues, We would like to invite your contributions to the session titled “Magma Evolution and Longevity from Source to Surface” (V018) at the AGU 2025 Fall Meeting in New Orleans, LA, from the 15th to the 19th of December. Session Description: Magma bodies within a volcanic system may evolve physically (i.e. in depth, size, shape, and melt fraction) and chemically (i.e., mineral, melt, and whole rock geochemistry) on a variety of timescales. The coupling of chemical data with numerical modeling, experiments, and geophysical datasets has proven vital to constraining the evolution and longevity of magma bodies. Some questions relevant to this area of research include: How does magma change petrologically, rheologically, and physically prior to and during ascent? How do we infer the quantity, geometry, geographic distribution, and development of magma bodies? How do these factors impact how we interpret residence times? How does this body of work improve forecasts of eruptions and their impacts? We especially welcome contributions from interdisciplinary studies across all geologic settings that utilize geochemical, physical, and/or modeling datasets to reflect on magma and plumbing system evolution. Session link: https://agu.confex.com/agu/agu25/prelim.cgi/Session/249248 The abstract submission deadline is Wednesday, July 30th, 2025. We look forward to receiving your submissions. With best regards, Rose Gallo, Abigail Nalesnik, Jessica Bersson, Kendra Lynn -- Rose Gallo PhD Candidate Dept. of Earth Sciences University of Hawai'i at Mānoa (she/her)