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