1/9 Puzzle PTuesday

123456789101112131415161718
Across
  1. 4. What force pulls object toward the center of the Earth?
  2. 7. Who wrote Romeo and Juliet?
  3. 8. What is the hardest natural substance on Earth?
  4. 12. What term describes an animal that eats both plants and meat?
  5. 14. What is the freezing point of water in degrees Celsius?
  6. 16. What country is home to the Great Barrier Reef?
  7. 17. What type of angle measures more than 90 degrees but less than 180 degrees?
  8. 18. How many continents are there on Earth?
Down
  1. 1. What element has the chemical symbol O?
  2. 2. What planet is known as the Red Planet?
  3. 3. What is the largest internal organ in the human body?
  4. 5. What is the capital city of Japan?
  5. 6. What is the main language spoken in Brazil?
  6. 9. What gas makes up most of Earth's atmosphere?
  7. 10. What is the largest ocean on Earth?
  8. 11. What is the smallest prime number?
  9. 13. Which organ in the human body is responsible for pumping blood?
  10. 15. What polygon has eight sides?