Unit 6 Nature

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Across
  1. 1. walls to hold water
  2. 6. artificial lake
  3. 8. stop being fresh
  4. 10. holes in water pipes
  5. 11. protected area for animals, plants
  6. 13. not have any left
  7. 14. become extinct
Down
  1. 2. network of pipes
  2. 3. producing heat, smell, gas
  3. 4. small flow of water
  4. 5. producing,selling new product
  5. 7. become better after cloud or rain
  6. 9. trapping heat from the Sun
  7. 12. process which goes from liquid into vapor