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