Land, Sea and Sky

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Across
  1. 1. What is another word for 'ocean'?
  2. 5. Which animals fly?
  3. 6. What is bad for the environment?
  4. 7. What isn't biodegradable
Down
  1. 2. What is around us?
  2. 3. What are animals considered?
  3. 4. What do animals live in?
  4. 8. What are we living on?
  5. 9. What is above you?