Energy

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Across
  1. 3. the complicated nature of something
  2. 4. to follow a course of activity
  3. 7. the process of changing from one state to another
  4. 8. a particular way of doing something
Down
  1. 1. not willing to do something
  2. 2. a rule or situation that puts a limit on something
  3. 5. not obvious and therefore difficult to notice
  4. 6. the ability to so something