Hillslopes are dynamic interfaces where weathering, water flow, vegetation, and sediment transport shape the critical zone and influence hydrologic, geomorphic, and ecological systems. This session seeks contributions that advance understanding of hillslope evolution and weathering processes in the critical zone. We welcome observational, experimental, and modeling studies that explore linkages among bedrock weathering, hillslope morphology, biotic processes, and landscape evolution. Contributions may include field observations of landscape response to perturbations (e.g., fires, landslides, droughts, tectonics), models of hillslope and critical zone evolution, and applications of novel geochemical, geophysical, and remote sensing techniques. We aim to highlight interdisciplinary research that connects mineral- to landscape-scale processes and advances understanding of how biological, physical, and chemical processes interact to shape critical zone structure and function over time.