Crossword Puzzle

1234567891011121314151617181920
Across
  1. 4. a policy by which governments do not discriminate against imports or exports
  2. 6. dense forest found in tropical areas of heavy rainfall
  3. 10. one who advocates to preserve built environment
  4. 12. a slum settlement of plywood, cardboard boxes or others
  5. 13. cutting down trees in forests or rainforests
  6. 14. harmful substances introduced into an environment
  7. 15. plant and animal species in their natural environment
  8. 17. to achieve a transaction, an agreement, etc
  9. 20. a source of economic wealth
Down
  1. 1. to put in danger or peril
  2. 2. generation of seismic waves which can be destructive
  3. 3. the act or process of growing, progressing, or developing
  4. 5. to replant an area that was formerly forested
  5. 7. the external surroundings in which a plant or animal lives
  6. 8. migration of an increasing proportion of into cities
  7. 9. the state of being prepared or ready
  8. 11. technique involving cutting and burning of forests to create fields.
  9. 16. the act or an instance of migrating
  10. 18. frontier between political or geographic regions
  11. 19. an increase in size, number, significance, etc