Crossword puzzle

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Across
  1. 2. A shortage of rainfall.
  2. 3. tribe of people that live in east Africa.
  3. 6. the practice of one nation.
  4. 7. No money or materials.
  5. 8. It can make agriculture possible.
  6. 9. who use the cleared land for growing.
  7. 11. includes railroads, bridges.
  8. 15. farming grows only to eat to live.
  9. 17. They fish and hunt for food.
  10. 18. shortage.
  11. 19. Diffusion The spreading of ideas.
Down
  1. 1. They wander in search of food.
  2. 4. Erosion natural processes wear away.
  3. 5. A form a small group of people.
  4. 10. something left over.
  5. 12. An area with little or no moisture.
  6. 13. becomes dryer and less.
  7. 14. crop grow and sell crops.
  8. 16. It is a cultural concept.