sorting materials into groups

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Across
  1. 3. Wood is a ___________ substance
  2. 4. Material that allow light to pass through them only partially
  3. 7. Material which can be compressed easily
  4. 8. Iron nail _________ in water
  5. 9. Materials have bumps on their surfaces
  6. 10. Glass is a ___________ material
  7. 11. sorting materials according to their similarities and dissimilarities
  8. 14. Materials do not have bumps
  9. 19. Substances that completely dissolve in water
  10. 20. Objects are made from
  11. 21. Light materials _________ in water
Down
  1. 1. The process of placing similar things together
  2. 2. Insoluble gas
  3. 5. Materials are dull in appearance
  4. 6. It is a shine on the surface of all metals
  5. 12. Substance which do not dissolve in water
  6. 13. liquids that are insoluble in water
  7. 15. Gas which dissolve in water
  8. 16. Material which are difficult to compress
  9. 17. Immiscible liqiud
  10. 18. The liquid which get mixed with water completely