unit 9 crossword

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Across
  1. 4. people moving into cities
  2. 6. can be replaced
  3. 10. natural resource humans use to make things
  4. 11. reaction of sunlight
  5. 12. wise use of natural resources
Down
  1. 1. drinkable water
  2. 2. ex. water
  3. 3. formed by remains
  4. 5. land becomes more desert-like
  5. 7. water behind dam
  6. 8. careful management of resources
  7. 9. removal of trees