Environmental Engineering

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