Across
- 4. act of being cleaned by passing through
- 6. America's largest wetland
- 7. hold much of the fresh water on Earth
- 9. little to no life because no nutrients
- 11. water that is a mix of fresh and salt
- 13. life sustaining substance
- 14. many trees and shrubs fed by rain
- 16. filled with many grasses
- 18. seasonal change in a lake that flips it
Down
- 1. area of land with a shallow layer of water
- 2. a large lentic system with life around the edges
- 3. a small lentic zone with great amounts of life
- 5. often filled with moss and evergreen trees
- 6. ecosystem of fresh and salt water mixed
- 8. holds water for human use
- 10. a lake created from a cut-off meander
- 12. nutrient build up creates algae
- 15. how acidic or basic a substance is
- 16. trees with roots that can grow in water
- 17. water that is not moving or moving slowly