Environmental Engineering

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Across
  1. 6. something or someone famous and admired by many people; is thought to represent something of importance
  2. 9. to improve the way something is done or used so that it is as effective as possible
  3. 12. something that is easy to recognize, such as a tall tree or building, and that helps you know where you are
  4. 13. connected with beauty and the study of beauty
  5. 14. to get rid of something, especially something that is difficult to get rid of
  6. 15. a very small creature that lives in plants or carpets
  7. 16. the gas produced when an engine is working
  8. 18. not easily noticed
Down
  1. 1. to improve a machine or building by putting new and better parts in after it has been used for some time
  2. 2. for a particular purpose or in a particular situation
  3. 3. a ball shape
  4. 4. in a general way, relating to the main facts rather than the details
  5. 5. something that makes a place comfortable or easy to live in
  6. 7. to make a good combination with someone or something else
  7. 8. an important plan or process to achieve a particular aim or to solve a particular problem
  8. 10. works well and is the result of clever thinking and new ideas
  9. 11. the quality of doing something well and effectively, without wasting time, money, or energy
  10. 17. the central and most important part of an area, system, or activity that all of the other parts are connected to