Pollution is a substance that acts negatively in a ecosystem, in a living thing or in the physical environment.
It harms the health of the living things. We find this pollution in the volcanic eruptions because they expel sulphur. But we can also find it in big cities due to the gases that the cars or the factories expel.
It is found in water (rivers, lakes, seas...). Pollution with plastics or spills, such as weistwater or products from factories.
The soil pollution can affect the drinkable water with chemical products that are thrown under the land.