Energy Island

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Across
  1. 3. a difficult task or problem
  2. 8. someone or something that provides what is wanted or needed
  3. 9. not long ago
  4. 11. capable of producing desired results without wasting materials, time, or energy
  5. 12. more than two but not many
  6. 14. something that happens as a result of a particular action or set of conditions
  7. 19. a situation in which events happen in a way that is not planned or expected
  8. 20. normal or usual
Down
  1. 1. the way one person or thing is different from another
  2. 2. very big
  3. 4. to use something for a particular purpose
  4. 5. extremely good or large
  5. 6. able to be replaced by nature
  6. 7. freedom from outside control or support
  7. 10. a large plan that usually takes a lot of planning, money, and work
  8. 13. the movement towards a goal or result
  9. 15. to change something into a different form
  10. 16. to make a machine, a service etc. ready to be used in a certain place
  11. 17. to think about problems or fears
  12. 18. to get or reach something by working hard