watershed and water pollution

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