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Across
  1. 4. (adj.) able to be recycled
  2. 6. (adj.) able to decay naturally and in the way that is not harmful
  3. 8. (adj.) involving risk or danger, especially to someone's health or safety
  4. 11. (v.) to use something, especially fuel, energy or natural materials
  5. 16. (n.) used water and waste substances produced by human bodies, that are carried away from houses and factories through pipes under the ground
  6. 17. (n.) a form of energy that is carried by wires, cables, etc., and is used to provide light, heat or power to make machines work
  7. 19. (n.) a substance that pollutes something, especially air and water
  8. 20. (n.) the way that someone looks to other people
  9. 21. (n.) the existence of a large number of different kinds of animals and plants which make a balanced environment
  10. 22. (n.) a feeling of being annoyed
  11. 24. (n.) a situation when people spend more money than they should
  12. 28. (n.) a natural ability to influence and interest other people and make them admire you
  13. 29. (n.) the fact or process of becoming worse
  14. 31. (n.) the practise of training students to obey rules and control their behaviour, and punishing them if they do not
  15. 35. (n.) a person who has completed the school studies
  16. 36. (adj.) connected with the way plants and living creatures are related to each other and to their environment
  17. 40. (adj.) able to be used again
  18. 41. (n.) food that remains at the end of a meal after you have finished eating
  19. 43. (n.) the activity of using messages on social networking sites, emails, etc. to frighten or upset someone
  20. 45. (n.) smoke or gas that is unpleasant to breathe in
  21. 47. (adj.) describing someone who is not in place because of illness, etc.
  22. 48. (n.) the state of being extremely fat
  23. 51. (n.) actions which hurt others physically
  24. 53. (n.) a substance that makes something dirty
  25. 55. (v.) to laugh at someone in order to have fun or embarrass him/her
  26. 57. (adj.) thinking about a person or thing too much or all the time
  27. 58. (n.) the uncomfortable feeling in a social situation
  28. 60. (n.) a substance that causes death or serious illness if it is swallowed or absorbed into the body
  29. 61. (n.) a failure to understand someone correctly
  30. 62. (n.) the way in which plants, animals, and people are related to each other and to their environment
  31. 63. (v.) to study something you have already learnt to prepare for an examination or a test
  32. 65. (n.) an excessive pride in yourself, especially in your own appearance, abilities or achievements
  33. 72. (n.) an official record that shows the courses a student has taken and the marks he/she has achieved
  34. 73. (n.) the feeling of sadness because you have no friends
  35. 75. (n.) a feeling of sadness, guilt and embarrassment caused by doing something wrong or stupid
  36. 76. (v.) to put a type of animal, bird or plant back into a region where it once lived
  37. 78. (adj.) not behaving in a way which is as calm and wise as people expect from someone of your age
  38. 79. (n.) the planting of new trees in an area where there used to be a forest
  39. 80. (n.) a feeling of sadness because something is not as good as you expected, or has not happened in the way you hoped
Down
  1. 1. (n.) the act of cutting down or burning all the trees in an area
  2. 2. (n.) the state of feeling bored
  3. 3. (n.) the process of teaching, training and learning in a school to improve knowledge and develop skills
  4. 5. (adj.) not using artificial chemicals in the growing of plants and animals for food or other products
  5. 7. (n.) the act of using something until it is completely finished
  6. 9. (n.) an amount of money that is given by a school or an organisation to help pay for the studies of a person
  7. 10. (adj.) with too many people living in a country or a city
  8. 12. (v.) to make a piece of land that is naturally too wet or too dry suitable for farming or building
  9. 13. (n.) an action that is taken in order to make someone suffer because he/she has done something wrong
  10. 14. (n.) an official document stating that you have completed a course of study or passed an examination
  11. 15. (n.) the process of making air, water, soil, etc. dirty
  12. 18. (n.) knowing that something exists and is important
  13. 23. (n.) the red spots appear on the face and neck
  14. 25. (n.) a chemical substance used to kill insects and small animals that destroy crops
  15. 26. (n.) the opposition to authority or the unwillingness to obey rules or accept normal standards of behaviour
  16. 27. (n.) an argument or a disagreement between people
  17. 30. (v.) to treat a waste substance so that it can be used again
  18. 32. (adj.) to describe something that is likely to stay in good condition for a long time without breaking or getting weaker, even if used a lot
  19. 33. (n.) a mark on a school record showing that a student has done something wrong or behaved badly at school
  20. 34. (n.) a punishment of being kept at school for a time after classes have ended
  21. 37. (n.) the process of taking too many fish from the sea, a river, etc. that the number of fish in it becomes very low
  22. 38. (n.) the practice of treating people differently in an unfair way
  23. 39. (n.) a situation in which a plant, an animal, a way of life, etc. stop existing
  24. 42. (adj.) wearing clothes that are in fashion
  25. 44. (n.) the process of making somewhere, e.g., parks and other areas, greener with trees and plants in a city
  26. 46. (n.) the way that you behave towards someone or something that show how you think and feel
  27. 49. (n.) a student's behaviour in school
  28. 50. (n.) the pressure and worry caused by problems in your life
  29. 52. (v.) to make a place or substance less pure or make it poisonous
  30. 53. (adj.) made dirty, polluted or poisonous by the addition of a harmful substance, chemical waste
  31. 54. (n.) all the animals and plants in an area, and the way they affect each other and the environment
  32. 56. (v.) to use energy, water, etc. as little as possible so that it lasts a long time
  33. 59. (n.) the use of energy, food or materials; or the amount that people use
  34. 61. (n.) a mark on a school record showing that a student has done something well and is deserving praise
  35. 64. (n.) the burning of things until they are completely destroyed
  36. 66. (adj.) harmful to other people, or to society as a whole
  37. 67. (v.) to change a substance back to a harmless natural state by bacteria
  38. 68. (adj.) made to be used once and thrown away
  39. 69. (adj.) able to continue for a long time without causing damage to the environment
  40. 70. (n.) the state of feeling very sad and without hope
  41. 71. (n.) the period of becoming sexually mature
  42. 74. (n.) a feeling of worry and nervousness about something
  43. 77. (n.) a form of air pollution that looks like a mixture of smoke and fog, caused by smoke from cars and factories in cities