English crosswords

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Across
  1. 2. a high flammable liquid
  2. 3. the substance between cells or in which structures are embedded.
  3. 6. a numerical or constant quantity placed before and multiplying the variable in an algebraic expression (e.g. 4 in 4x y).
  4. 8. cleverly
  5. 10. a thin layer on top of a solution
  6. 13. a confusing and difficult problem or question.
  7. 14. the theory that certain knowledge is impossible.
  8. 15. experts at something’s
  9. 17. a metal ring to support a stick
  10. 19. a non living thing
Down
  1. 1. equal
  2. 4. a person accusing someone of illegal actions
  3. 5. an algebraic expression of the sum or the difference of two terms.
  4. 7. become concentrated inside the bodies of living things.
  5. 9. a quantity representing the power to which a fixed number (the base) must be raised to produce a given number.
  6. 11. capable of being decomposed by bacteria or other living organisms and thereby avoiding pollution.
  7. 12. mystery
  8. 13. inclusive
  9. 16. sad or depressed
  10. 18. friendly and pleasant