Scientific Christmas

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Across
  1. 3. Needed to power Christmas lights
  2. 4. Path for electric current in Christmas lights
  3. 9. Evergreen plant decorated at Christmas
  4. 10. Material that allows electric current for Christmas lights
  5. 13. Element found in coal for naughty children
  6. 14. Force that keeps Santa on the roof
  7. 16. Measure of how hot or cold something is, like winter air
  8. 17. Process plants use to make food, even Christmas trees
  9. 19. Gas we breathe, also in snow and ice
  10. 20. Frozen water crystals falling from clouds
Down
  1. 1. Flow of electric charge that makes Christmas lights shine
  2. 2. Material that prevents electric current, like plastic on wires
  3. 5. Animal that pulls Santa's sleigh
  4. 6. Plant that grows on trees and is used as decoration
  5. 7. Celestial object often placed on top of a Christmas tree
  6. 8. Ice crystals forming on surfaces in cold weather
  7. 11. Solid state of water
  8. 12. Used in fridge decorations and science experiments
  9. 15. Electrical potential that powers festive decorations
  10. 18. Earth's axis point where Santa is said to live