Math is fun- end of school edition

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Across
  1. 7. the energy center of a cell
  2. 8. He's the science guy
  3. 10. A British scientist that wrote "Origin of the Species"
  4. 14. Chester's weight (21 lbs.) in ounces, written in Roman numerals
  5. 18. one and one half plus two-thirds
  6. 20. one and one half times seven-eighths
  7. 22. the circumference of an Oreo in centimeters (about)
  8. 23. the type of volcano that Mt. St. Helen's is
  9. 24. 0.000001
  10. 26. he's awesome
  11. 28. the year Ms. Eineichner was born in Roman numerals
  12. 29. molten rock that is still inside the Earth
  13. 30. an anagram for "rude insects like ears, yum!"
Down
  1. 1. Where Miss Kelly is from?
  2. 2. the guy that has the Infinity Stone in his head
  3. 3. the state Minh Tam will live in next school year
  4. 4. Max's new dog or a droid in Star Wars
  5. 5. one and one half divided by seven-eighths
  6. 6. 0.010
  7. 9. any living cell that has an organized nucleus
  8. 11. "The Eternal City"
  9. 12. the Harry Potter spell that goes "swish and flick"
  10. 13. 0.14
  11. 14. a protist parasite that infected Milwaukee's water
  12. 15. the type of rock that is compressed over time
  13. 16. a legume, a butter, or a dog
  14. 17. what you should do every day
  15. 19. one and one half minus seven-eighths
  16. 21. what you need to make the divisor for fraction division
  17. 25. Bella's favorite word
  18. 27. the approximate area (cm squared of an Oreo)