Across
- 4. Waste water from homes and businesses
- 6. Low area where water collects
- 9. Water beneath Earth's surface
- 10. Water movement into the soil
- 12. Removal of excess water from land
- 14. Water that flows over land into bodies of water
- 15. Substances that feed plants, sometimes causing water pollution
- 17. Small, narrow river
- 18. Harmful substances entering the environment
- 20. Protecting natural resources, like clean water
Down
- 1. Process that removes particles from water
- 2. Land area saturated with water, helps filter pollutants
- 3. Plant-like organisms that bloom in polluted water
- 5. Particles that settle at the bottom of water
- 7. Underground layer of water-bearing rock
- 8. Poisonous or harmful to living things
- 11. Area of land that drains to a common waterway
- 13. Substance that makes water unsafe
- 16. Large natural stream of water flowing to the sea
- 19. Wearing away of land by water or wind