Some pollutants do not dissolve in water as their molecules are too
big to mix between the water molecules. This material is called
particulate matter and can often be a cause of water pollution.
- The suspended particles eventually settle and cause a thick silt at the bottom. This is harmful to marine life that lives on the floor of rivers or lakes.
- Biodegradable substances are often suspended in water and can cause problems by increasing the amount of anaerobic microorganisms present.
- Toxic chemicals suspended in water can be harmful to the development and survival of aquatic life.
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