Travelling, geography

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Across
  1. 3. the largest and deepest of Earth´s of 5 oceans
  2. 6. not harmful to the environment
  3. 8. destruction of large areas of trees
  4. 10. to be in danger of extinction
  5. 11. a company which organizes your holiday
Down
  1. 1. there are 3 climate zones: tropical, polar and …
  2. 2. a place where you stay over night
  3. 4. when air, water, etc. are dirty
  4. 5. the safest means of transport
  5. 7. a piece of land surrounded by water
  6. 9. a thing for transporting people or goods, such as a car, lorry, etc.