Q: When drinking water is treated, what is the term for when chemicals cause solids in the water to clump together?


Read this paragraph and choose the correct option from the provided answers:

You can see how water for drinking is treated in Figure below . Treating drinking water requires at least four processes: 1. Chemicals are added to untreated water. They cause solids in the water to clump together. This is called coagulation. 2. The water is moved to tanks. The clumped solids sink to the bottom of the water. This is called sedimentation. 3. The water is passed through filters that remove smaller particles from the water. This is called filtration. 4. Chlorine is added to the water to kill bacteria and other microbes. This is called disinfection. Finally, the water is pure enough to drink.

 Choices:

- clumping

- oxidation

- plasma

- coagulation


A:
coagulation