cross word

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Across
  1. 4. ip in networking
  2. 7. gas used in balloon
  3. 8. rna stands for
  4. 10. law of motion by newton
  5. 11. device required for internet connection
  6. 14. amu in scientific terms
  7. 15. a period of 10 years
  8. 17. father of modern physics
  9. 18. vr stands for
  10. 20. study of earthquakes
  11. 21. for every reaction there is equal and opposite reaction
Down
  1. 1. father of electricity
  2. 2. the planet closed to the sun
  3. 3. www stands for
  4. 5. si unit of force
  5. 6. 2nd e in ieee
  6. 9. the element of atomic number 7
  7. 12. who invented steam engine
  8. 13. first man to step on moon
  9. 16. sos in highways
  10. 19. hardest natural substance