Dear Colleagues, Happy New Year! The *Annual Goldschmidt Meeting* will be held in *Prague July 6-11, 2025.* We would like to draw your attention and encourage you to submit contributions to the following session: * “The Evolution of Seawater Chemistry Through Time: Insights into Interactions Among Earth's Spheres”*. Theme 12, session 12c. *Abstract deadline: February 26 at 5:59 pm EST *(23:59 CET/UTC +1) Submit an abstract & browse sessions: conf.goldschmidt.info/goldschmidt/2025/cfp.cgi <https://urldefense.com/v3/__https:/conf.goldschmidt.info/goldschmidt/2025/cfp.cgi__;!!IKRxdwAv5BmarQ!f2rq1_lxVEoeCxwRNEKgbcTIX-xlXizn9Z-yNUP5s7vcW0IppMKI4XQBwYuRENABH9OmET3nyIIIr13fSdaETCWhTr5huQ$> Grant info: conf.goldschmidt.info/goldschmidt/2025/meetingapp.cgi/ModuleMeetingInfo/GrantProgram <https://urldefense.com/v3/__https:/conf.goldschmidt.info/goldschmidt/2025/meetingapp.cgi/ModuleMeetingInfo/GrantProgram__;!!IKRxdwAv5BmarQ!f2rq1_lxVEoeCxwRNEKgbcTIX-xlXizn9Z-yNUP5s7vcW0IppMKI4XQBwYuRENABH9OmET3nyIIIr13fSdaETCWVJFcrYw$> *Keynote Speaker:* Itay Halevy (Weizmann Institute of Science) *Conveners:* Pan Zhang (Northwest University) Mebrahtu Weldeghebriel (Princeton University) Kang-Jun Huang (Northwest University) Weiqiang Li (Nanjing University) *Full session description:* The chemical composition of seawater—encompassing major and trace elements, isotopic compositions, alkalinity, redox conditions, pH, and salinity—has fluctuated significantly throughout Earth's history. These changes provide a unique and indispensable window into the complex interactions among Earth's spheres, including the evolution of biosphere habitability, shifts in atmospheric oxygen and carbon dioxide levels, the elemental and mineral composition of the lithosphere, and material cycling between Earth's internal and external layers. Understanding the long-term variations in seawater chemistry, the key drivers behind these changes, and their quantitative links to geological processes has greatly advanced our knowledge of Earth's surface system evolution and long-term habitability. This session invites contributions focused on the evolution of seawater chemistry across various timescales, its implications for ocean habitability, and its interactions with Earth's diverse spheres. We encourage presentations that explore seawater chemistry evolution in the geological record and the mechanisms driving it, through the development and reevaluation of marine proxies and archives, experimental simulations, data integration, numerical modeling, and big data approaches, aiming to foster a comprehensive understanding of seawater chemistry evolution and key geological processes across Earth's spheres. Best regards, Mebrahtu -------- Mebrahtu F. Weldeghebriel, PhD Harry Hess and NSF Postdoctoral Fellow <https://carboncycle.princeton.edu/people/mebrahtu-f-weldeghebriel> Department of Geosciences 208 Guyot Hall, Princeton University, NJ 08544 Google Scholar <https://scholar.google.com/citations?user=nyub6VwAAAAJ&hl=en> | Research Gate <https://www.researchgate.net/profile/Mebrahtu_Weldeghebriel/>