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During pedogenesis mineral, organic, and biological soil components are “glued” together to form an aggregated porous media that defines a three-dimensional, extremely large, and heterogeneous biogeochemical interface (BGI). BGI may be considered as an inhabited and discontinuous domain that separates the immobile phases from the mobile liquid and gaseous phases, and which maintains strong gradients. BGIs properties will have a significant impact on soil processes and functions, i.e. the formation and the stability of soil aggregates, the bioavailability of (in-)organic compounds, or the spatio-temporal distribution of solutes and gases. Visualizing and characterizing the architecture of BGIs, identifying factors controlling their formation and maturation, as well as examining processes occurring at BGIs have been identified as a decadal challenge in soil science (Totsche et al., 2010). Yet, quantitative understanding of the role of BGIs in the functioning of soils requires a multidisciplinary approach, combining the knowledge on their composition and properties obtained from advanced spectroscopic, (spectro-)microscopic, and tomographic techniques, with the information on their processes and functions acquired from theoretical models and concepts that ultimately will link the processes to functions across spatial and temporal scales. The symposium aims at annealing different approaches and concepts developed in soil physicochemistry, soil hydrology, and soil ecology to identify factors controlling the architecture of BGIs, to link the processes operative at the molecular- and organism-scale to the phenomena active at the aggregate-scale in a mechanistic way, and to explain the medium- to long-term behaviour of solutes and colloids in soil within a general mechanistic framework. We heartily invite scientists form all fields of soil-related research that are occupied and intrigued in gaining a mechanistic understanding of the formation and functioning of soils in a perpetually changing environment.