Science and Christmas

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Across
  1. 2. Supernatural being that uses wings to generate lift
  2. 3. A decoration that uses a solidified fuel burned through a wick
  3. 4. Often wired in series, a classic tree decoration
  4. 7. Drug consumed by lots of adults over the festive period
  5. 12. Solid form of water that we often dream about at Christmas
  6. 13. Metallic element given as a gift to the baby Jesus
  7. 14. Traditional Christmas parasite
  8. 15. Was happily photosynthesising until cruelly cut down to decorate a home
  9. 16. Transport used by Mary and Joseph - Equus Asinus
  10. 18. Green vegetables from the same family as broccoli and cauliflower
  11. 20. Part of a holly plant that encourages seed dispersion
Down
  1. 1. Traditional decoration that makes a high pitched sound when shaken
  2. 3. A Christmas tradition containing explosives (and a bad joke)
  3. 5. Reindeer seem to be able to overcome this force
  4. 6. Recyclable, wood pulp based Christmas greeting
  5. 8. Fossil fuel given as a Christmas present to those on the naughty list
  6. 9. The type of radiation given out from Rudolph's nose
  7. 10. Christmassy bird - Erithacus rubecula
  8. 11. An element that begins with the same letter as the beardy present guy
  9. 17. Selectively bred Christmas day favorite
  10. 18. Product of incomplete combustion that ruins Santa's suit
  11. 19. Ball of hydrogen gas that guided the three wise men