19-General Trivia Difficulty-Medium

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Across
  1. 3. Smallest continent
  2. 5. Famous African river
  3. 6. Gas humans need to breathe
  4. 8. English playwright of Hamlet
  5. 12. Highest mountain above sea level
  6. 13. Largest ocean on Earth
  7. 14. Flightless bird of Antarctica
Down
  1. 1. Hardest natural mineral
  2. 2. Powerful tropical storm
  3. 4. Largest planet in the solar system
  4. 7. Physicist associated with relativity
  5. 9. Planet known for its rings
  6. 10. Mountain that erupts lava
  7. 11. Closest planet to the Sun
  8. 13. Ancient Egyptian monument