Paul's Birthday Crossword

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