Across
- 3. Microscopic organisms that drift at the water's surface.
- 5. The lake zone as deep as sunlight can reach.
- 9. The dark bottom zone of a lake with no light.
- 10. Part of a river where water moves very fast over rocks.
- 11. A treeless wetland with grasses and reeds.
- 14. Living or growing entirely under the water's surface.
- 15. Using sunlight to produce food energy.
- 16. A fan-shaped sediment deposit at a river's mouth.
- 19. Very small, bubbling freshwater streams.
- 20. Non-living factors like water speed or sunlight.
Down
- 1. A trait that helps an organism survive its environment.
- 2. A curve or loop in a slow-moving river.
- 4. The act of refilling groundwater supplies.
- 6. The shallow zone of a lake near the shore.
- 7. Land that is often underwater or very soggy.
- 8. A wetland characterized by trees and vines.
- 12. Particles of rock or organic matter moved by water.
- 13. Substances that help plants grow and fill in ponds.
- 17. A smaller stream flowing into a larger river.
- 18. Organisms like bacteria that eat dead organic matter.