science

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Across
  1. 4. a distinguishing quality
  2. 5. the central and most important part of an object
  3. 7. the presence in or introduction into the air of a substance which has harmful or poisonous effects.
  4. 10. from breathing in carbon monoxide,nitrogen oxides,particulate matter and sulfur dioxide
  5. 12. burning of nitrogen in hot engines
  6. 13. incomplete burning of fossil fuels
  7. 15. walking and cycling to reduce the eyes,nose and throat
  8. 16. conferred by or based on inheritance
  9. 17. forms when nitrogen oxides and sulfur dioxide dissolve in rain water
Down
  1. 1. reducing,reusing and recycling.
  2. 2. the gelatinous liquid that fills the inside of a cell
  3. 3. using less electricity so that less fossil fuels are burnt in power stations
  4. 6. volcanic eruptions
  5. 8. a unit of heredity which is transferred from a parent to offspring
  6. 9. a triotomic very creative form of oxygen that is a blush irratating gas.
  7. 11. forest fires
  8. 13. the semipermeable membrane surrounding the cytoplasm of a cell
  9. 14. causes poor visibility.Irritates the eyes,nose and throat