Basic Science: WATER (part 2)

Water quality, Substances that Contaminate our Water, quality of a good water, prevention of water contamination, what a good water should be, substances that contaminate water, sources of water pollution,
Odourless, colourless, tasteless, untreated sewage, garbages, defecation, washing clothes, water bodies, animal bathing, chemical, detergent, fertiliser, oil spill, oil industry, oil tanker, river, lake, stream, germ,