challenge 2

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Across
  1. 2. order of operations
  2. 6. remnant of a quotient
  3. 7. a heart doctor
  4. 8. german for lightning war
  5. 9. polygon with parallel opposite sides
  6. 11. spanish for blue
  7. 12. sodium chloride
  8. 14. hardest bone in the human body
  9. 15. octopus, snail, spider, earthworm
  10. 17. order of top line of letters on a keyboard
  11. 20. shark skeletal material
  12. 22. adjective for a grabbing tail
  13. 24. when an offensive player gets tackled within his own endzone
  14. 25. russian citadel
Down
  1. 1. element with one electron
  2. 3. a2+b2=c2
  3. 4. born dark brown or black, then turns black and white
  4. 5. largest landlocked country
  5. 7. distance around a circle
  6. 10. 4th most populous city
  7. 13. He went TO the store.
  8. 16. 1 of 2 northern flowing rivers in the world
  9. 18. a small infectious agent that replicates only inside the living cells of other organisms
  10. 19. not fahrenheit
  11. 21. pencil residue
  12. 23. second planet from the sun