How much do you know about Yggdrasil?

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Across
  1. 4. grumpy guard of bridges
  2. 6. The god of beauty
  3. 7. lovers of gems
Down
  1. 1. The human lair
  2. 2. I eat my own tail
  3. 3. I'm the fastest horse in the world!
  4. 5. No hair? I still shine!