The natural world

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Across
  1. 2. Protection
  2. 7. Something that causes great difficulties
  3. 8. the natural world
  4. 9. the natural area where a plant or animal lives
  5. 12. damage to air, water, etc.
  6. 13. To change to fit a situation or environment
  7. 17. Varied; of many kinds
  8. 21. Small in numbers or amount
  9. 23. To cutting down of trees for commercial use
  10. 24. Relating to change from one type to another
  11. 26. To catch; to interrupt the progress of something
  12. 28. To gradually increase over time
  13. 31. To cut down
  14. 32. To decide
  15. 33. To reduce to least possible amount
  16. 38. To disappear
  17. 39. Tough; able to endure difficult conditions
Down
  1. 1. Methods
  2. 3. To change from liquid to gas; loss of water to the air
  3. 4. Loss of soil from the action of water or wind
  4. 5. Plants
  5. 6. The goodness in food
  6. 10. To make weaker by mixing with water
  7. 11. to reach past, get bigger
  8. 14. Producing a lot of something
  9. 15. The edge of something
  10. 16. To keep from changing; maintain
  11. 18. Strong; sudden and destructive
  12. 19. The removal of trees from a large area
  13. 20. Living on the land
  14. 22. Very severe or difficult
  15. 24. To grow well
  16. 25. a large number, a collection
  17. 27. To be in place; exist in
  18. 29. Wetness or water
  19. 30. Living in the water
  20. 34. Whole; complete
  21. 35. To prevent; slow down
  22. 36. Many; numerous
  23. 37. A sudden or big change