Across
- 3. liquid that dissolves substances
- 4. amount of salt in a solution
- 6. valuable water resource on earth
- 7. involves conserving and protecting something valuable
- 10. occurs when less dense water is drawn away from the shore
- 11. area of land drained by a river
- 15. oxygen found in a body of water
- 18. area at the mouth of a river that breaks into the ocean
- 19. marine ecosystem controlled by movements of tides
- 20. where surface water drains
- 21. marine ecosystem that is often realize on chemical energy
Down
- 1. process of cleansing water to make it more potable
- 2. the cycle of water on earth
- 5. cloudy or opaque
- 8. underground rock layer
- 9. all the waters on the earth's surface
- 12. substance below 7 on the ph scale
- 13. measure of how suitable water is for drinking
- 14. marine ecosystem that realize on algae
- 16. substance above 7 on the ph scale
- 17. scale used to identify acids and bases