Asher's iceberg crossword

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Across
  1. 3. restrained by cold weather
  2. 4. floats away
  3. 5. A large diving bird with a long neck
  4. 7. simple plants, includes seaweed
  5. 9. A continent with penguins, ice and polar bears
Down
  1. 1. a couple of birds that can't fly
  2. 2. A large floating mass of ice
  3. 6. a killer whale
  4. 7. very very old
  5. 8. Huge thick masses of ice