Geography Science, and Civics Crossword Challenge

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Across
  1. 4. What planet do we live on?
  2. 7. What is the largest country in the world by land area?
  3. 8. What is another word for 1000 years?
  4. 13. What is the longest river in the world?
  5. 17. What is the capital of Canada?
  6. 18. What gas do plants absorb from the air?
  7. 22. What is the smallest continent?
  8. 23. What are the first ten amendments to the Constitution called?
  9. 24. What is the largest ocean on Earth?
Down
  1. 1. What process do plants use to make food from sunlight?
  2. 2. What country gifted the Statue of Liberty to the United States?
  3. 3. What is the capital city of Brazil?
  4. 5. What country is Hawaii part of?
  5. 6. How many states are in the United States?
  6. 9. What is the only U.S. state that starts with the letter L?
  7. 10. What continent do we live in?
  8. 11. What country is south of the United States?
  9. 12. What is the supreme law of the land?
  10. 14. What is the capital of France?
  11. 15. What is the only U.S. state that ends with the letter K?
  12. 16. Who appoints federal judges?
  13. 19. What continent is Egypt in?
  14. 20. What is the capital of the United States?
  15. 21. What continent is Japan in?