Christmas crossword

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Across
  1. 1. Frozen water you might see at Christmas
  2. 3. What scientists do when they watch carefully
  3. 6. A green decoration brought into the house at Christmas
  4. 7. Santa travels in this
  5. 8. A shiny decoration often hung on a Christmas tree
  6. 12. Delivers presents all around the world
  7. 13. A state of matter with a fixed shape, like ice
Down
  1. 2. Everything is made from these and they are found on the periodic table
  2. 4. A gift you give someone at Christmas
  3. 5. A gas we breathe in, shown as O on the periodic table
  4. 9. A person who investigates how things work
  5. 10. A state of matter like air on a cold morning
  6. 11. A song sung at Christmas time