Geochemical processes are the chemical reactions and interactions that occur within the Earth's crust, particularly within rocks, minerals, and fluids. These processes play a crucial role in shaping the Earth's surface, controlling the composition of water and soil, and influencing the distribution of elements and minerals. Geochemical processes involve the transport, transformation, and exchange of chemical elements and compounds through various geological and environmental systems. This includes processes such as weathering, sedimentation, hydrothermal alteration, and metamorphism. Researchers studying geochemical processes seek to understand how these processes occur, how they are influenced by factors such as temperature, pressure, and pH, and how they impact the Earth's environment and ecosystem. By studying geochemical processes, scientists can gain insights into the Earth's history, predict natural hazards, and manage resources more effectively.