Thunder Rolling in the Mountains

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Across
  1. 4. an open grassland
  2. 7. the way a particular group of people lives
  3. 9. very intelligent
  4. 12. arguments or debates
  5. 15. the act of becoming larger
  6. 16. resources materials that come from nature
  7. 18. an area of land given to Native Americans
  8. 20. usual or accepted practices
  9. 21. doing well or being successful
Down
  1. 1. gradually weakened and destroyed
  2. 2. ideas about what is important
  3. 3. strong opinions
  4. 5. took over the place or position of
  5. 6. an agreement
  6. 8. flat mountain
  7. 10. disturbing or breaking into without being wanted
  8. 11. many more that what is needed
  9. 13. established customs and activities
  10. 14. and argument or fight
  11. 17. wealth and riches
  12. 19. effect on something