General knowledge 2

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Across
  1. 4. The hardest natural material
  2. 7. A dwarf planet in our solar system
  3. 9. An animal that carries its baby in a pouch
  4. 11. A global network connecting computers
  5. 12. A dry place with little or no rain
  6. 13. The gas essential for human breathing
  7. 15. A drink made from roasted beans
  8. 16. The author of “Romeo and Juliet”
  9. 18. A flash of electricity in the sky
  10. 24. The largest rainforest in the world
  11. 26. A global sports competition held every four years
  12. 29. The molecule that carries genetic information
  13. 30. An arc of colors seen after rain
Down
  1. 1. A mountain that can erupt with lava
  2. 2. The force that pulls things toward Earth
  3. 3. A musical instrument with keys
  4. 5. A tool used to see very small objects
  5. 6. A large white bear that lives in the Arctic
  6. 8. The capital city of the United Kingdom
  7. 10. The highest mountain on Earth
  8. 14. A huge system of stars and planets
  9. 17. A book of maps
  10. 19. A tool used to clean teeth
  11. 20. The biggest planet in our solar system
  12. 21. A device that stores electrical energy
  13. 22. A yellow metal used for jewelry
  14. 23. Ancient triangular structure in Egypt
  15. 25. The scientist who discovered gravity
  16. 27. A device used to take photos
  17. 28. The country with the Great Wall