Collaboration Nation

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Across
  1. 4. What organ in the human body pumps blood?
  2. 5. What is the freezing point of water in Celsius?
  3. 9. In U.S. history, who was the first president?
  4. 12. respiration What is the opposite of "photosynthesis" in living organisms?
  5. 15. In grammar, what part of speech is the word quickly?
  6. 17. What is the main language spoken in Brazil?
  7. 19. What gas do plants take in during photosynthesis?
  8. 20. What is the process of liquid water changing to gas called?
  9. 21. In geography, which continent is the Sahara Desert located on?
Down
  1. 1. mark What punctuation mark ends a question?
  2. 2. What is the capital of France?
  3. 3. In literature, who wrote Romeo and Juliet?
  4. 6. A triangle with all equal sides is called what?
  5. 7. What element has the chemical symbol "O"?
  6. 8. What is the longest river in the world?
  7. 10. In math, what is the square root of 144?
  8. 11. What is the largest planet in our solar system?
  9. 13. Last name of who is known as the “Father of Computers”?
  10. 14. In algebra, what is the solution to 2x = 10? x = ___.
  11. 16. In biology, what is the powerhouse of the cell?
  12. 18. In chemistry, how many protons does carbon have?