Puzzle #29

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Across
  1. 2. The opposite of 'day'
  2. 4. Solid frozen water
  3. 6. Synonym for 'happy'
  4. 7. The capital of Canada
  5. 8. Popular sport played on ice
  6. 10. In addition
Down
  1. 1. A place where books are kept
  2. 3. Study of living organisms
  3. 5. Opposite of 'light'
  4. 9. A device used to measure time