crossword puzzle

2. oxygen/oxygen found in a body of water: measurements may be used to indicate the degree of health of the water and its capability f sustaining an ecosystem
5. ocean/type of marine ecosystem that is often reliant on chemical energy
7. measure of how suitable may be for drinking
8. scale/the scale that is used to identify acids and bases
9. to the amount of salt contained within a solution
13. cycle/ cycling the water on earth through a variety of process
14. area of land where surface water drains when the ground is unable to absorb it
15. ocean/type of marine ecosystem that relies on algae o act as producers and provide the majority of energy for the food chain; the majority of the world's oxygen is produce in this ecosystem
16. process that occurs when less-dense surface water is drained away from shore by currents and is replaced by cold. denser. more nutrients-rich water from below
18. liquid that dissolves substances called solutes

1. rock layer that contains a vital source of water for human consumption and use
3. conserving and protecting something valuable such as the planet its ecosystem and natural resources
4. substance above 7 on the pH scale
6. basin/ the area of land drained by a river and its branches
9. of marine ecosystem that is controlled by movement of tides and contains a diverse array of well-adapt organism due to the charging nature of the ecosystem
10. the water on or surrounding the surface of the planet
11. substance below 7 on the pH scale
12. or opaque; due to stirred up sediment or particles within the water
17. treatment/The process of purifying or clarifying to make it more potable