Commander Curry's puzzle

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Across
  1. 3. the transition zone between the Sahara and the savanna
  2. 5. funny number from high schooler
  3. 9. the southernmost country in Africa
  4. 12. the end of the Nile
  5. 14. fertile land into desert
  6. 15. language group that practices Christianity and Islam
  7. 16. countries that have the least access to clean water
Down
  1. 1. countries with no access to water for trade
  2. 2. the mix of Arab and Bantu language
  3. 4. the loss of vegetation
  4. 6. funny number from song
  5. 7. the land of pyramids
  6. 8. the world's largest non-polar desert
  7. 10. the longest river in the world
  8. 11. the loss of soil through wind or water
  9. 13. the biggest rainforest in Africa