SCIENCE crossword puzzle

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Across
  1. 3. the study of everything
  2. 5. gravitation
  3. 7. a theory
  4. 8. the smallest thing
  5. 10. momentum
  6. 12. energy
  7. 13. the first attempt to describe matter in terms of atoms
  8. 16. the study of the inorganic world
  9. 18. third law
  10. 20. a theory
  11. 21. something from the periotic table
Down
  1. 1. to look closely
  2. 2. when 2 or more elements react
  3. 4. ensure proper behavior and reliable research
  4. 6. to spin from the gravitational pulphysical sciencethe study of the inorganic world
  5. 9. second law
  6. 11. first law
  7. 14. a rule of what happens
  8. 15. a theory
  9. 17. the study of matter
  10. 19. something that measures heat