think, link and solve!

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Across
  1. 4. A substance that living things need to grow and stay healthy
  2. 8. A division of a larger organization responsible for specific tasks
  3. 9. The purpose or particular job of something
  4. 10. A system in which people or things are ranked by importance or authority
  5. 12. To talk too proudly about your achievements
  6. 14. The process of making a system or organization work
  7. 17. Belief about what should or is likely to happen
  8. 18. To explain the exact meaning of a word or concept
  9. 20. A community of living things interacting with their environment
  10. 21. To make an approximate calculation or judgment
Down
  1. 1. To add substances to soil to help plants grow
  2. 2. The release of gases or other substances into the air
  3. 3. The process of bringing something back to its original condition
  4. 5. change Long-term changes in Earth's temperatures and weather patterns
  5. 6. Unusual or impressive enough to deserve attention
  6. 7. The total number of people or organisms living in an area
  7. 11. Going from side to side rather than up and down
  8. 13. Going straight up and down rather than from side to side
  9. 15. Feeling stressed because of demands from others
  10. 16. Having exceptional natural talent or ability
  11. 19. Working well without wasting time, energy, or resources