Crossword puzzles

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Across
  1. 5. Equal
  2. 6. The diffrence
  3. 7. Principle of ____
  4. 10. A common recurring goal
  5. 11. To be efficent
  6. 12. To reuse
  7. 13. Something sustabinable
  8. 15. Come from Earth
Down
  1. 1. Energy from the sun
  2. 2. littering
  3. 3. To buy things that are good for earth
  4. 4. To keep the difference between the two things
  5. 8. A resource that comes from earth
  6. 9. To save
  7. 14. Comes from nature