project work (Science) Ulfah2E/TG7

Edit Answers
123456789101112131415161718192021
Across
  1. 3. to measure air quality. The P_ _ is based on the level of air pollutants in the air.
  2. 4. C_ _ _ _ A_ _ is polluted by human activities and nature phenomena.
  3. 8. V_ _ _ _ _ _ _ reduce air pollution by walking and cycling to reduce the number of vehicles on the road .
  4. 11. H_ _ _ can be caused by man-made or natural forest fire!
  5. 16. D_ _ _ _ _ _ _ _ _ _ _ W_ _ _ _ removes salt from seawater and turns it into drinking water .
  6. 17. S_ _ _ _ _ D_ _ _ _ _ _ can cause respiratory problems.
  7. 18. N_ W _ _ _ _ is produced by recycling used water.
  8. 19. U_ _ _ _ _ _ _ _ _ W_ _ _ _ from homes and toxic waste from industries can contain harmful bacteria.
  9. 20. F_ _ _ _ _ F _ _ _ are burnt to generate electricity in power stations and to power engines in motor vehicles.
  10. 21. the O _ _ S _ _ _ _ S may also clog the gills of fish and cause them to die.
Down
  1. 1. P_ _ _ _ _ _ _ _ _ _ M_ _ _ _ _ is also produced during forest fires!
  2. 2. P_ _ _ _ _ _ _ _ mixture of many types!
  3. 5. N_ _ _ _ _ _ _ O _ _ _ _ are formed during lightning activity.
  4. 6. A _ _ _ R _ _ _ can corrode buildings and statues and may kill plants and fishes.
  5. 7. F_ _ _ _ _ _ _ _ _ _ can cause algae to grow rapidly on the surface of water , or even prevent sunlight from entering.
  6. 9. C_ _ _ _ W _ _ _ _ is needed to support life processes , for daily usage and raw material for industries.
  7. 10. C_ _ _ _ _ M_ _ _ _ _ _ _ can cause poisoning as it reduces the ability of blood to carry oxygen.
  8. 12. V_ _ _ _ _ _ _ _ _ E_ _ _ _ _ _ _ produces sulfur dioxide!
  9. 13. P_ _ _ _ _ _ _ _ _ released air in one part of the world can spread through the atmosphere and affect the air quality in the other parts of the world.
  10. 14. L _ _ _ _ _ may cause the turtles and birds to get trapped in the things and drown!
  11. 15. P _ _ _ _ _ _ _ _ _ can be harmful or futal aquatic animals.