Deep weathering covers, such as laterites, constitute a major expression of the critical zone, especially in tropical environments and participate significantly to the global geochemical budgets, weathering and erosion fluxes, and atmospheric greenhouse gas consumption. Despite their factual importance for the Earth surface, several important questions are still unanswered about their mode and timing of their formation, and their evolution in response to shifts in climatic and geodynamic forcing. We encourage all contributions addressing those questions using mineralogical studies, geochemical mass balance and isotopic signals in deep soil profiles or in rivers, dating tools at different time scales, or modeling approaches that can integrate those data to understand the evolution of deep weathering covers though time and their role in the global feedbacks between weathering and climate.