Lake Asphalt

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Across
  1. 5. Air travel hub
  2. 7. Major public road
  3. 8. Material used to block leaks
  4. 9. Not synthetic
  5. 11. Laying a road surface
  6. 13. Leading or representative product
  7. 14. Positively charged (chemistry term)
  8. 16. Large inland body of water
  9. 19. Structure that spans a gap or roadway
  10. 21. Item made for sale
  11. 23. Color commonly associated with asphalt
  12. 24. Sticky petroleum-based binder
  13. 25. Additive that changes properties
  14. 26. Purified through processing
  15. 27. Extracting materials from the earth
  16. 28. Heavy-equipment scoop
Down
  1. 1. Blends of immiscible liquids
  2. 2. Road surface depression
  3. 3. Underground passageway
  4. 4. Liquid surface coating
  5. 6. Aircraft takeoff and landing strip
  6. 10. Road-surfacing material made from bitumen
  7. 11. Sticky, tar-like substance
  8. 12. Finished road surface
  9. 15. End point or airport building
  10. 17. Protective surface layers
  11. 18. Caribbean island known for natural asphalt
  12. 20. Barrel for transporting materials
  13. 22. Binding material in construction
  14. 23. Extremely hot or bubbling