Across
- 5. radiation
- 8. plasma
- 10. balanced force
- 12. force
- 13. compounds
- 14. gravity
- 17. molecules
- 18. combustibility
- 19. conduction
- 20. reactivity
Down
- 1. pure substances
- 2. convection
- 3. unbalanced force
- 4. friction
- 6. speed
- 7. gas
- 9. motion
- 11. acceleration
- 15. solid
- 16. velocity