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