Vocabulary crossword

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Across
  1. 5. the worlds second largest religion
  2. 6. first humans were found here
  3. 8. Lack of water in a place
  4. 10. separation between Sahara and savanna
  5. 12. people originally from the Arabian peninsula
  6. 14. a tropical woodland with lots of rain
  7. 16. turning clean water bad with pollution
  8. 17. where are you
  9. 18. an area or division
  10. 19. traditions of a certain group of people
  11. 20. people and ideas get around
Down
  1. 1. turning functional land into deserts
  2. 2. the largest hot desert in the world
  3. 3. turning forests into wasteland
  4. 4. moving to a foreign country
  5. 7. what is it like when you get there
  6. 9. belief of the teachings of Jesus
  7. 11. people with a common cultural background
  8. 13. a member of the people of Zanzibar
  9. 15. a member of the people of south central Ghana