Semester Revision

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Across
  1. 3. the act of polluting
  2. 4. a lack of something you need or want
  3. 6. forming an essential part of something and needed to make it complete
  4. 8. the top layer or outside part of something
  5. 10. to get rid of something that is not wanted or needed
  6. 12. continuous or regular over a long period of time
  7. 15. something you cannot explain
  8. 17. a period of ten years
  9. 18. the yellow stems of dried crops such as wheat
  10. 19. involving serious behavior or serious attitudes
Down
  1. 1. someone in book, movie, etc
  2. 2. making you feel very sad
  3. 3. something that needs a lot of skill, energy, and determination to deal with or achieve, especially something you have never done before and will enjoy doing
  4. 5. a block used for building walls and other structures
  5. 7. a substance used in chemistry or produced by a process involving chemistry
  6. 9. worth a lot of money
  7. 11. to communicate ideas or feelings indirectly
  8. 13. a plant or animal group whose members all have similar general features and are able to produce young plants or animals together
  9. 14. a feeling that you experience, for example love, fear, or anger
  10. 16. an artificial river
  11. 17. a wall built across a river to stop the water from flowing, especially in order to create a lake or to help to produce electric power
  12. 20. to make someone relaxed enough to sleep
  13. 21. very soft wet earth