ENVIRONMENT EDUCATION

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Across
  1. 1. One of the layers of the atmosphere
  2. 3. The best quality coal
  3. 6. Contamination of air, water and soil
  4. 7. A secondary pollutant
  5. 8. Unit of sound intensity
  6. 10. It is the unwanted sound
  7. 12. Gradual increase in the temperature of earth's surface
  8. 13. Another word for poisonous
  9. 15. Burning of waste at high temperature
  10. 16. Downward curling of leaves
  11. 17. Fuels like petroleum, coal and natural gas
  12. 19. Permanent clearance of forest areas
  13. 20. Main culprit for ozone layer depletion
Down
  1. 2. It is commonly known as liquid gold
  2. 4. Largest contributor to global warming
  3. 5. It is called black gold
  4. 9. Combination of Smoke and Fog
  5. 11. Variety and variability of life on Earth
  6. 14. Seriously under threat of extinction
  7. 18. Process of minimizing waste by transforming them into new products