Environmental issues

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Across
  1. 1. some animals have two of this
  2. 3. small pieces of rubbish left in public places
  3. 6. material that is used in HẢO HẢO noodle box
  4. 8. extremely large
  5. 10. unhappy, unpleasant
  6. 12. very dirty, not safe for human or living things anymore
  7. 13. a group of animals that includes cows, buffalo,... kept for milk or meat
Down
  1. 2. commonly have one horn on its nose
  2. 4. be in danger/ be seriously harmed
  3. 5. a mass of ice
  4. 7. very unusual, very little/ few
  5. 8. not now existing, not living on earth anymore
  6. 9. smoke + fog
  7. 11. soy bean