Across
- 5. mass divided by volume
- 6. another term for burning
- 8. energy is released out
- 13. the rainforests of the sea
- 14. ozone layer is present in this layer of atmosphere
- 18. it can occur below 100 degree C
- 19. colourful part of a flower
- 20. reaction in which a substance reacts with oxygen
Down
- 1. fusion of male and female gametes
- 2. it is a nuclear fuel
- 3. reaction in which the final temperature decreases
- 4. hot air rises up due to this
- 7. gas released when metals react with water
- 9. energy stored in fossil fuels
- 10. scattering seeds away from parents
- 11. unit of pressure
- 12. it is a type of thermal insulator
- 15. study of environment
- 16. it can be compressed easily
- 17. thread like structures present in fungus