Paul's Birthday Crossword

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Across
  1. 4. A seabird of northern and Arctic waters which nests in holes
  2. 6. A process in which substances combine chemically with oxygen from the air and typically give out bright light, heat, and smoke
  3. 9. A process in which an agent causes an organic substance to break down into simpler substances
  4. 10. The smallest composite number
  5. 11. Legal drinking age in UK and Ireland
  6. 12. A system of government by the whole population or all the eligible members of a state, typically through elected representatives
Down
  1. 1. Scandinavian seafaring pirates and traders who raided and settled in many parts of NW Europe
  2. 2. Relating to or produced by the internal heat of the earth
  3. 3. Relating to the structure of the earth's crust and the large-scale processes which take place within it
  4. 5. The second of the twelve named periods into which a year is divided
  5. 7. a brittle transparent crystalline solid
  6. 8. A supernatural creature of folk tales