Powerful words

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Across
  1. 4. a way of measuring how good something is
  2. 5. a leading person or organisation
  3. 7. an idea or theory
  4. 8. to jump to a conclusion
  5. 9. to come to towards something or someone
Down
  1. 1. something which remains the same over time
  2. 2. able to be made use of
  3. 3. to work out something complex
  4. 6. something which is good or of an advantage
  5. 8. a particular amount of space within a set of boundaries