Science at Christmas!

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Across
  1. 3. Made of bone and used for defence and scraping away snow and soil to find food.
  2. 6. Flammable organic liquid found in brandy.
  3. 7. A tree belonging to the division Pinophyta and used as Christmas trees.
  4. 8. If my Christmas tree had a mass of 1200g, and a volume of 40cm3, what would its density be in g/cm3?
  5. 10. What causes potatoes to go brown just after you peel them for making roast potatoes?
  6. 12. The fibrous material in your roast parsnips and carrots.
Down
  1. 1. Often found on Christmas trees, made of the polymer polyvinyl-chloride (PVC).
  2. 2. Sending one of these by post releases 140g of carbon dioxide into the environment.
  3. 4. The species of bird given on the first day of Christmas.
  4. 5. The main element in cinnamon.
  5. 9. Solid precipitation which occurs in a variety of minute ice crystals at temperatures well below 0 °C but as larger snowflakes at temperatures near 0 °C.
  6. 11. The microorganism used to make bread rise and carbonate drinks.
  7. 13. The device that emits light from fairy lights on a Christmas tree.
  8. 14. A luminous ball of gas, mostly hydrogen and helium, held together by its own gravity and you may put one on top of your Chrismtas tree.