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. The waste matter discharged from the human body
Down
    1. Used water
    2. A pipe carrying sewage
    5. Micro-organisms which causes cholera
    7. A chemical to disinfect water

Answers (1)
S Sayak

Across
    3. SEWAGE
    4. SLUDGE
    6. SANITATION
    8. EXCRETA
Down
    1. WASTEWATER
    2. SEWER
    5. BACTERIA
    7. OZONE

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