Unit 4

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Across
  1. 4. the system or group that governs a country or region.
  2. 5. the reason why something happens.
  3. 6. a legal member of a country or community.
  4. 11. causing little or no damage to the environment.
  5. 12. a group of people living or working in the same area or sharing common interests.
  6. 13. a large area of land covered mainly with trees.
  7. 17. a natural liquid resource essential for life.
  8. 19. a structured group formed for a particular purpose.
  9. 22. facts or information that support a claim or conclusion.
  10. 23. rubbish left in a public place instead of being disposed of properly.
  11. 24. to give time and effort to help without being paid.
  12. 27. free from dirt, pollution, or harmful substances.
  13. 28. the process of turning used materials into new products.
  14. 29. a person who studies the natural or physical world through research.
  15. 30. animals and plants living in their natural habitats.
  16. 32. the power needed to produce movement, heat, or electricity.
  17. 33. using more money, energy, or resources than necessary.
  18. 34. trap heat in Earth’s atmosphere.
  19. 35. unwanted material left after something is used.
  20. 36. the ability to meet needs while protecting future resources.
  21. 39. the introduction of harmful substances into the environment.
  22. 41. causing injury, damage, or negative effects.
  23. 47. achieving a result with little waste of time, energy, or resources.
  24. 49. a person who works to help others without pay.
  25. 51. a result that follows from an action or event.
  26. 55. a change or result caused by something else.
  27. 56. to keep something safe from harm or damage.
  28. 57. to turn organic waste into nutrient-rich material for soil.
  29. 58. a person who works to protect the natural environment.
Down
  1. 1. causing little or no harm to the environment.
  2. 2. to maintain something in its original or good condition.
  3. 3. a useful supply, material, or asset that meets a need.
  4. 7. to take part in an activity, project, or event.
  5. 8. the protection and careful management of nature and resources.
  6. 9. a long period with little or no rain.
  7. 10. the variety of living organisms in an area or ecosystem.
  8. 14. a person who campaigns for social or environmental change.
  9. 15. a difference that occurs when something becomes different.
  10. 16. the process of growth, progress, or improvement.
  11. 18. businesses involved in producing related goods or services.
  12. 20. an advantage or positive result.
  13. 21. discarded household or commercial rubbish.
  14. 25. acting carefully and accepting the results of one’s actions.
  15. 26. an overflow of water onto normally dry land.
  16. 28. a duty to act correctly and accept the consequences.
  17. 31. fire an uncontrolled fire that spreads through woodland.
  18. 36. able to continue without exhausting resources or causing lasting damage.
  19. 37. a solid fossil fuel burned to produce energy.
  20. 38. an answer or method for solving a problem.
  21. 40. existing in or produced by nature rather than made artificially.
  22. 42. to decrease the amount of resources used or waste produced.
  23. 43. at serious risk of extinction.
  24. 44. a difficult task or problem that tests ability or effort.
  25. 45. designed or practiced in a way that protects the environment.
  26. 46. to use an item again instead of throwing it away.
  27. 48. contaminated by harmful substances or waste.
  28. 50. a liquid fossil fuel refined into petrol and other products.
  29. 52. a business organization that provides goods or services.
  30. 53. to process used materials so they can be used again.
  31. 54. to teach knowledge or skills.