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Across
  1. 3. Protection of natural resources
  2. 5. Precipitation with high acidity
  3. 8. Removal of forests
  4. 10. Area draining into a river
  5. 12. Where river meets sea
  6. 17. Meeting needs without harming future
  7. 18. Simple aquatic plants
  8. 19. Rising of cold seawater
  9. 21. Study of ocean depth
  10. 22. Coastal tree or shrub
  11. 25. Contamination of environment
Down
  1. 1. Gas protecting from UV rays
  2. 2. Vent underwater geyser
  3. 4. Underground water source
  4. 6. Heat from Earth's interior
  5. 7. Small marine organisms
  6. 9. Temperature gradient in water
  7. 11. Replanting of trees
  8. 13. Trapping of heat by atmosphere
  9. 14. Deep ocean zone
  10. 15. Sunlit ocean layer
  11. 16. Enrichment of water by nutrients
  12. 20. Air pollution by smoke and fog
  13. 23. Salt concentration in water
  14. 24. Landform at river mouth