Earth's Lines, Hemispheres, States, Continents, and Countries

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Across
  1. 4. Second largest of the Great Lakes
  2. 9. Northern Lights
  3. 10. Largest river by discharge volume
  4. 11. Day of the Dead
  5. 12. Largest hot desert in the world
  6. 14. Between the eastern and western hemispheres
  7. 16. Cowboys
  8. 17. Between the northern and southern hemispheres
  9. 18. Forbidden City
  10. 19. Known for alligators
  11. 20. Highest mountain in Maine
Down
  1. 1. Largest lake in Maine
  2. 2. Sydney Opera House
  3. 3. Russia's symbolic center
  4. 5. Right above the USA
  5. 6. Golden Gate Bridge
  6. 7. Eiffel Tower
  7. 8. Fifth largest lake in the world
  8. 13. At the top of the Earth
  9. 15. Second largest ocean