Across
- 3. water pollution caused by high nitrogen compound levels
- 5. how salty a body of water is
- 6. runoff caused by a storm that usually carries pollutants
- 7. an are with a mix of salt and freshwater
- 10. organism that swims freely through the ocean
- 11. a living organism that indicates the health of the water
Down
- 1. organisms that make up most of the ocean's life
- 2. pollution caused by high levels of phosphorus compounds
- 4. cloudiness of water
- 5. the act of people taking care of the earth
- 8. organism that live at the bottom of the ocean
- 9. the movement of water in the ocean