sorting materials into groups

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