Science Puzzle

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Across
  1. 2. heavy metal
  2. 4. immovable
  3. 7. H2O
  4. 8. burning temperature
  5. 9. watery
  6. 11. air
  7. 12. corrosive Chemical
  8. 13. easily shattered
  9. 14. water vapour
  10. 16. squeezed/squished
  11. 18. collects metal
Down
  1. 1. freezing
  2. 3. degree of sound
  3. 5. portion of matter
  4. 6. bubbles in water
  5. 10. growth in a substance
  6. 13. invisible vapour
  7. 15. bursting matter
  8. 17. you find it at the beach
  9. 19. split this to make a bomb