Guess???

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Across
  1. 2. Ancient arena in Rome
  2. 4. Legendary queen of Egypt
  3. 8. Gas we breathe to live
  4. 10. Largest hot desert in the world
  5. 12. Classical music composer from Austria
  6. 13. Global sports event held every 4 years
  7. 14. Ancient triangular tomb in Egypt
  8. 15. Planet with stunning rings
Down
  1. 1. Mountain that erupts with lava
  2. 3. Smallest country in the world
  3. 5. Scientist famous for relativity
  4. 6. Pouched jumper from Australia
  5. 7. Landmark of Paris
  6. 9. World’s biggest rainforest
  7. 11. Playwright who wrote Hamlet