Leaching is the process by which solutes are removed from solid materials, often through the action of water or other solvents. In environmental science, it commonly refers to the way nutrients, pollutants, or minerals are washed out from soil or waste materials, potentially contaminating groundwater. In agriculture, leaching can lead to the loss of essential nutrients from the soil, affecting crop growth. The efficiency and impact of leaching depend on factors like soil composition, rainfall, and the nature of the substances involved.