The "Solid Earth" refers to the earth beneath our feet or terra firma, the planet's solid surface and its interior, on which we live. The "Fluid Earth" refers to the Earth above our feet, the planet’s wet, icy or windy surface layer and its exterior, in which we live. Earth system science has long recognized the importance of feedbacks between the Solid and Fluid Earth, for instance through the effect of volcanic activity on climate or the effects of climate on tectonic and magmatic processes. The study of the interactions between Solid and Fluid Earth requires a multidisciplinary approach crossing the boundaries of traditionally separated disciplines such as geophysics, geodynamics, petrology, volcanology, stratigraphy, geomorphology, (palaeo-)biology, (palaeo-)oceanography and climatology. This session invites contributions pertaining to the recognition, quantification and understanding of the couplings between the Fluid and Solid Earth dynamics through all kind of modeling and observation tools. Emphasis will be put on interdisciplinary research efforts and innovative approaches to tackle both “classical”, or newly-recognized interactions between the Fluid and Solid Earth.