North and West Africa

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Across
  1. 2. huge shifting sand dunes
  2. 3. older sections of a city in Algiers
  3. 7. underground rock layers that store large amounts of water
  4. 8. marketplace
  5. 9. process by which grasslands change to desert
  6. 12. places of worship for followers of Islam
  7. 14. nonreligious policies
  8. 15. area fed by underground water
  9. 16. group of houses surrounded by walls
  10. 17. dusty wind
  11. 18. tropical tree with roots that extend both above and beneath the water
Down
  1. 1. area formed from soil deposited by a river at its mouth
  2. 4. tropical grasslands with only a few trees
  3. 5. to allow animals to strip areas so bare that plants cannot grow back
  4. 6. small plots that grow just enough to feed their families
  5. 10. Egyptian farmer
  6. 11. long period of extreme dryness and water shortages
  7. 13. small particles of rich soil