The environment

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Across
  1. 1. to continue to exist
  2. 4. to cause a baby animal to start forming
  3. 6. the contamination of rivers, seas etc.
  4. 7. the structure of an animal' body
  5. 8. a layer of oil floating on the sea after an accident
  6. 9. (of a species) being in danger of becoming extinct
  7. 11. CO2
  8. 12. air pollution found in cities caused by a mixture of smoke, gases and chemicals
Down
  1. 1. the opposite of deep (eg. Water)
  2. 2. the act of using more energy than needed
  3. 3. a thick layer of ice and snow that covers large areas of land
  4. 5. an animal that gives birth to babies and feeds them on milk
  5. 8. food grown without the use of synthetic chemicals
  6. 10. an animal's natural home