What is river pollution?

River pollution refers to the introduction of harmful substances into water bodies, which can degrade water quality and harm aquatic life. This occurs through various means, such as industrial discharges, agricultural runoff, sewage overflow, and littering. When pollutants enter a river, they can lead to a range of negative impacts, including decreased oxygen levels, toxicity to wildlife, and the disruption of the natural ecosystem. This makes the correct answer particularly relevant as it captures the essence of what constitutes river pollution and highlights the critical issue of contamination in freshwater resources. Understanding this concept is essential for recognizing the importance of water quality management and environmental conservation.