What is the difference between direct and indirect contamination?

Direct contamination occurs when harmful substances are introduced directly into a medium, such as water or soil, often through spills or leaks. Indirect contamination, on the other hand, happens when pollutants enter the environment through secondary pathways, such as runoff from contaminated surfaces or through the food chain. While direct contamination poses immediate risks, indirect contamination can lead to more widespread and often delayed effects. Both forms of contamination can significantly impact ecosystems and human health.