Across
- 2. A famous South American river that carries the most water in the world
- 4. A type of dam that produces electricity
- 9. A plastic material that often pollutes oceans
- 12. A large mass of frozen freshwater
- 13. The biggest ocean on Earth
- 14. The contamination of rivers, lakes, and oceans.
- 17. The process of treating sewage water so it can be reused
- 18. A serious problem caused by excessive water use in dry areas.
Down
- 1. Essential for life, covers 71% of the Earth.
- 3. A person who studies water and its movement
- 5. Famous international organization that promotes water conservation
- 6. The process of cleaning dirty water.
- 7. Water that people can drink safely
- 8. A large body of saltwater.
- 10. When water turns into vapor.
- 11. The major river running through Egypt
- 15. Essential gas dissolved in water for fish to survive.
- 16. Natural disaster caused by excessive rainfall