Across
- 4. element
- 7. science
- 10. atmosphere
- 13. meteorology
- 14. hydrosphere
- 16. jamess watt
- 17. carbon
- 19. theory
- 20. kinetic
- 22. experiment
- 23. electrical energy
- 26. acidity
- 27. thermodynamics
- 28. horsepower
- 29. biosphere
- 30. ecology
Down
- 1. nuclear energy
- 2. growing population
- 3. geoscience
- 5. pacific ring of fire
- 6. heat energy
- 8. environmental chemistry
- 9. water
- 11. compound
- 12. reactant
- 15. energy
- 18. poverty
- 21. metabolism
- 24. lithosphere
- 25. typhoon belt