Science Crossword Challenge

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Across
  1. 4. Makes its own food (8 letters)
  2. 5. A complete path for electricity (15 letters)
  3. 6. A deep cut in the earth (6 letters)
  4. 7. Moving dirt from one place to another (8 letters)
  5. 9. Rubbing against something (8 letters)
  6. 10. A gas we breathe out (14 letters)
  7. 12. Breaks down dead things (10 letters)
  8. 14. Two paths for electricity (14 letters)
  9. 18. What you measure in an experiment (15 letters)
  10. 19. Gets energy by eating other things (7 letters)
  11. 20. Changes from gas to liquid (11 letters)
  12. 22. coal, oil, and gas (18 letters)
  13. 25. from plants and animals (12 letters)
  14. 26. What changes in an experiment (17 letters)
  15. 27. Can’t be replaced (13 letters)
Down
  1. 1. circuit A path that doesn’t connect (15 letters)
  2. 2. Rock made from sediment (17 letters)
  3. 3. One path for electricity (12 letters)
  4. 8. A gas we breathe in (6 letters)
  5. 10. circuit A path that electricity follows (13 letters)
  6. 11. Where land meets water (5 letters)
  7. 13. Changes from liquid to gas (11 letters)
  8. 15. Can be replaced (9 letters)
  9. 16. Breaking down rocks and dirt (9 letters)
  10. 17. Where water gathers (11 letters)
  11. 21. Stacking of layers (10 letters)
  12. 23. A valley shaped like a U (8 letters)
  13. 24. Large ice moving slowly (7 letters)