From Nature

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Across
  1. 4. Clean up
  2. 10. Almost like
  3. 12. Creates a product
  4. 14. Grows on fields
Down
  1. 1. Create dirt in the air
  2. 2. A measurement
  3. 3. Vegtables/crops as fuel
  4. 4. Not petrol
  5. 5. Term for farming
  6. 6. Lots of
  7. 7. Money
  8. 8. Change into
  9. 9. Collect crops/vegtable
  10. 10. Bi-product
  11. 11. Increased
  12. 13. Works on farm