Across
- 2. extraction of minerals and ores
- 7. to over exploit resources
- 9. coal and gas are the examples
- 11. contamination of natural things
- 13. the major air pollutant
- 17. these cells are used to convert solar energy to electrical energy
- 18. a breed of animal
- 19. the largest desert in the world
- 20. where an animal lives
Down
- 1. the lungs of the earth
- 3. the longest river
- 4. atmosphere close to the earth surface
- 5. the tree which gives oxygen 24 hours
- 6. green house gas
- 8. acid rain is caused by
- 10. flora and fauna
- 12. a type of renewable resources
- 14. population of zero
- 15. verity of plants and animal species in an environment
- 16. a plant which is used as medicine in skin care