You have already learned about some of the ways how surface and groundwater can become contaminated and about the importance of water treatment to make the water safe to drink. There are different types of pollutants from a variety of sources that can harm the quality of water. In this study session you look more closely at these pollutants, where they originate from and their effects. You also consider how water sources can be protected from pollution.

पिछ्ला सुधार: मंगलवार, 2 अगस्त 2016, 9:59 पूर्वाह्न