Geography!

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Across
  1. 3. Dropping of sediments
  2. 4. Flat grassland region
  3. 5. Sudden ground shaking
  4. 8. Region good for farming
  5. 10. Thick heavy oil in sands
  6. 11. Greenhouse gas release
  7. 15. Ground frozen year-round
  8. 17. Rapid snow slide
  9. 18. Mountains in western Canada
  10. 19. Rounded ancient mountains
  11. 21. Big wave from quake
  12. 22. Long period without rain
Down
  1. 1. Power from moving water
  2. 2. When water overflows
  3. 6. Resource used faster than replaced
  4. 7. Powerful rotating storm
  5. 9. Resource replaced naturally
  6. 12. Slow-moving ice mass
  7. 13. Elevated flat land
  8. 14. Cold treeless region
  9. 16. Wearing down of land
  10. 20. Oldest rock region