The critical zone is the Earth’s permeable layer that extends from the tops of the trees to the bottom of the groundwater. It is a complex system that includes the atmosphere, land surface, vegetation, and groundwater, and is vital for supporting life on Earth. Research in the critical zone focuses on understanding the interactions and processes that occur within this zone, such as weathering, nutrient cycling, water flow, and carbon storage. This research is essential for managing and preserving the Earth’s natural resources and ecosystems, as well as for addressing environmental challenges such as climate change and land degradation.