Geochemistry at Utrecht University focuses on the geochemistry of the Earth surface. We combine field data with experimental, modeling and theoretical approaches to elucidate biogeochemical cycles and mineral transformations along the aquatic continuum, e.g. from weathering of rocks to biogeochemistry of deep-sea sediments. We have access to world-class facilities, including fully equipped isotope and organic geochemistry laboratories and nano-scale mass spectrometry. We investigate (bio)geochemical processes from the nanometer to the global scale and utilize the geological record to better project Earth surface conditions in the future.