Across
- 4. high levels of salt
- 6. shallow with sunlight
- 8. deep, deep in darkness
- 9. high tides and low tides
- 10. fresh meets salty
- 11. one direction
- 12. shines bright for photosynthesis
Down
- 1. surface of the sea floor
- 2. only 3% of water in the world
- 3. soil as a filter
- 5. living interacting with environment
- 7. rivers keep coming
- 8. water ecosystem
- 12. vary in size