Across
- 2. Headwaters of a river are usually ____.
- 5. Wetlands remove ____ from the water.
- 7. Free swimming organisms.
- 9. Wetlands act like ____.
- 10. Land that is sometimes underwater.
- 11. Bottom dwelling organisms.
- 12. Headwaters are full of _____.
Down
- 1. The beginning of a river is called the ___.
- 3. An increase in the amount of nutrients in a aquatic ecosystem
- 4. Organisms that float near the surface of the water
- 6. What have humans dumped in rivers?
- 8. Wetlands are important to fish and birds because they feed on the ____ found there.