Calibri",sans-serif">The Critical Zone is the thin habitable layer on the surface of our planet Earth. It is a interface  compartment where different spheres meet and interact (atmosphere, hydrosphere, lithosphere, and biosphere). It is this reactivity with that allows life to develop “on” Earth, or rather in the Critical Zone. In order to study this Critical Zone and the processes that makes our planet habitable, we are faced with physical limitations: the ground and subsoil are not transparent, and access to them is limited to methods that are generally destructive, such as sampling or drilling.