Sustainable tourism

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Across
  1. 2. A useful commodity or valuable possession
  2. 6. Underwater structures made from calcium carbonate, containing a rich variety of wildlife
  3. 7. An ancient civilisation in Central America
  4. 8. All the living things interacting with each other
  5. 10. The number and types of plants and animals
  6. 11. The study of birds in their natural habitat
  7. 12. Holidays that do not harm the environment
Down
  1. 1. Causing little or no damage to the environment
  2. 3. A species that is under threat of extinction
  3. 4. Travel away from home to visit another place
  4. 5. People living in one particular area, with a common nationality or social group
  5. 9. Holidays where many people visit a small area