Collaboration Nation

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