Which one is NOT a cause of water pollution?

The correct answer is Option (3) → Rainfall

• Urbanisation: Increased urban population leads to more sewage, construction waste, and other pollutants entering water bodies.
• Landslides: Landslides can carry sediment, debris, and pollutants from land into water bodies.
• Industrialisation: Industrial processes often release harmful chemicals and wastewater into water sources.

Rainfall, on the other hand, can actually cleanse the environment to some extent. While heavy rainfall can cause erosion and wash away pollutants from land, it primarily dilutes existing pollutants and carries them towards larger bodies of water, where they become more dispersed.