What was the hacker wearing?

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Across
  1. 2. What do you get when you cross a snowman and a vampire?
  2. 4. What is 28 ÷ 7?
  3. 5. Which animal has a really long neck?
  4. 7. What is the 5th planet in the solar system?
  5. 8. How many toes does a human normally have?
  6. 9. What does Blue and Red make?
  7. 11. Where is Big Ben?
  8. 12. What colour is the sky at night?
Down
  1. 1. If you drop me, I’m sure to crack, but smile at me and I’ll smile back. What am I?
  2. 3. What do we use to wash our hands?
  3. 5. What colour is grass?
  4. 6. What language is spoken in France?
  5. 10. Who sang Let It Go?
  6. 13. Which animal goes moo?