Five Weeks In A Balloon

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Across
  1. 2. Spews hot lava
  2. 4. Rise in body temperature
  3. 7. Longest River
  4. 8. Caffeinated drink
  5. 10. Largest Desert
  6. 12. "King of the jungle"
  7. 13. Piece of land surrounded by water
  8. 15. Dry barren area
  9. 17. Dry grassland
  10. 18. Zimbabwean waterfall
  11. 20. Piece of water surrounded by land
  12. 21. Hot air _ _ _ _ _ _ _
  13. 22. Caused by great heat
  14. 23. Scavenger bird
  15. 24. Known for its hump
  16. 26. Ocean west of Africa
  17. 28. User of a rifle
  18. 29. African country that's also a name
  19. 31. Thunder _ _ _ _ _
  20. 32. Horned herbivore
Down
  1. 1. Holder of medical degree
  2. 3. Aquatic land animal
  3. 5. London's country
  4. 6. _ _ _ _ _ _ of Gibraltar
  5. 9. Animal with a trunk
  6. 11. Second largest continent
  7. 14. Tropical forest
  8. 16. Essential for life
  9. 19. Vertical drop in a river
  10. 21. Measures atmospheric pressure
  11. 25. One that eats its own kind
  12. 27. Thrives with little water
  13. 30. Carries malaria