Puzzle 6

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Across
  1. 2. One of the three colour charges for quarks
  2. 6. Government system
  3. 10. A circular device capable of rotating on its axis
  4. 11. Cultural rebirth
  5. 12. To a small extent or degree
  6. 13. Star system
  7. 15. Political upheaval
  8. 18. From time to time
Down
  1. 1. Falling space debris
  2. 3. A metal pan used for cooking
  3. 4. Lake in Cumbria
  4. 5. large pipe forming the piston rod of a steam engine
  5. 7. An upwards struggle
  6. 8. A great amount (money)
  7. 9. A journey or excursion
  8. 12. Orchestral composition
  9. 14. Town or district
  10. 16. Viking City in England
  11. 17. Research or study