materials and material science (nouns and adjectives)

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Across
  1. 3. Matter, material, articles, or activities of a specified or indeterminate kind that are being referred to, indicated, or implied.
  2. 5. Not able to be seen through; not transparent.
  3. 6. A light touch or stroke, usually with the flat of the hand.
  4. 9. An act of striking or hitting someone or something; a movement of a pen, pencil, or paintbrush.
  5. 12. A substance or object that is firm and stable in shape; not a liquid or fluid.
  6. 13. A tiny spot or particle of something.
  7. 16. Firm and stable in shape; not liquid or fluid.
  8. 18. Made by chemical synthesis, especially to imitate a natural product.
  9. 20. A small, hard seed, especially of a food plant such as wheat, rice, or corn.
  10. 21. A situation in which people or things are crowded together; a vegetable.
  11. 22. A particular kind of matter with uniform properties.
  12. 24. Allowing light to pass through so that objects behind can be distinctly seen.
  13. 27. Having a solid, almost unyielding surface or structure.
  14. 28. A solid inorganic substance of natural occurrence.
  15. 32. A small fragment of dried bread, cake, or cracker.
  16. 33. A drop of clear salty liquid secreted from glands in the eye.
  17. 34. A substance used to give something a smooth and shiny surface when rubbed.
Down
  1. 1. Hard but liable to break or shatter easily.
  2. 2. Having a hole or empty space inside.
  3. 4. The force that attracts a body toward the center of the earth, or toward any other physical body having mass.
  4. 6. A heap of things laid or lying one upon another.
  5. 7. The resistance that one surface or object encounters when moving over another.
  6. 8. Easily broken or damaged; delicate.
  7. 10. Closely and neatly packed together; dense.
  8. 11. Having the properties of a liquid; flowing freely.
  9. 14. A crowd of people pressed closely together.
  10. 15. Closely packed together; thick.
  11. 16. The act of scrubbing something.
  12. 17. A small, thin piece of something that has come off a larger piece.
  13. 18. A neat pile of things.
  14. 19. The feel, appearance, or consistency of a surface or a substance
  15. 23. A mark or slight cut made on a surface.
  16. 25. Rigid; not easily bent or moved.
  17. 26. (of a liquid) made thinner or weaker by having water or another solvent added to it.
  18. 27. A cloth or material woven or knitted from yarn.
  19. 29. A substance that flows freely but is of constant volume, like water or oil.
  20. 30. A compact mass of a substance, typically without a definite or regular shape.
  21. 31. A hollow container used to give shape to molten or hot liquid material when it cools and hardens.