Environment & Health crossword puzzle

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Across
  1. 5. The process of treating raw water with alum
  2. 8. When exposed to air, water turning cloudy and reddish brown in colour indicates the presence of this mineral.
  3. 9. Another name for the biological layer seen on the surface of slow sand filter.
  4. 10. The carbonate hardness was formerly designated as
  5. 11. Radiation which has the ability to penetrate tissues and deposit
  6. 12. Waste water which does not contain human excreta(waste water from kitchens and bathrooms)
  7. 14. Nephelometric unit is used to express this parameter of water quality.
  8. 17. ___________thermometer can record air velocities as low as 10 feet per minute.
  9. 18. Hot fermentation process of composting is also known as _________________method
Down
  1. 1. Equipment used to calculate the amount of bleaching powder required to disinfect the well.
  2. 2. Monoxide A colorless, odorless gas produced by incomplete combustion of fossil fuels.
  3. 3. A harmful physical or chemical agent in the environment.
  4. 4. The presence of spores of C. perfringens and the absence of the coliform Group in water suggests ___ (recent/remote)faecal contamination
  5. 6. Equipment which measures the hearing ability.
  6. 7. An open area all around the house required for proper light and ventilation
  7. 9. A type of air pollution caused by the presence of excessive amounts of suspended particulate matter in the air.
  8. 12. Sewage is said to be ______ if the Biological Oxygen Demand is 300 mg/L. and above
  9. 13. A type of water pollution caused by the discharge of agricultural runoff into water bodies.
  10. 15. Luminous intensity( Brightness of a point source)
  11. 16. Type of well which taps water from the water-bearing stratum below the first impervious layer in the ground