Across
- 4. light waves
- 10. regular shape
- 13. bouy
- 14. circle breaks
- 16. chemistry
- 19. dices
- 20. dense
Down
- 1. heating and cooling
- 2. spread
- 3. spoke breaks
- 5. light
- 6. amorphous sand
- 7. characteristics
- 8. sink
- 9. 2 refraction indices
- 11. bulletproof
- 12. suspend
- 15. no shape
- 17. in liquid
- 18. length of a wave