Q.11.Here is a crossword puzzle. Good luck!

Across:
3. Liquid waste products
4. Solid waste extracted in sewage treatment
6. A word related to hygiene
8. Waste matter discharged from human body
Down:
1. Used water
2. A pipe carrying sewage
5. Micro-organisms which cause cholera
7. A chemical to disinfect water

Answer :

ACROSS :

3. Sewage

4. Sludge

6. Sanitation

8. Excreta

DOWN :

1. Wastewater

2. Sewer

5. Bacteria

7. Ozone

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