Hydrosphere

7. any syubstance below 7 on the pH scale
9. the area of land where surface water drains when the ground is unable to absorb it
11. a process that occurs when less-dense surface water is drawn away from shore by currents and is replaced by cold denser more nutrient-rich water from below
12. a measure of how suitable water may be for drinking
13. Underground rock layer that contains a vital source of water for human consumption and use
15. The process of purifying water to make it more potable
16. all the water on or surrounding the surface of the planet
17. Type of marine ecosystem that relies on algae to act as producers and provide majority of energy for the food chain
18. type of marine ecosystem that is controlled by movement of tides and contains a diverse array of well adapted organisms due to the changing nature if the ecosystem
19. any substance above 7 on the ph scale
20. cloudy or opaque

1. the area of land drained by a river and its branches
2. Cycling of water on earth through a variety of processes
3. valuable water resource on Earth; provides drinking water
4. amount of salt contained within a solution
5. oxygen found in a body of water
6. type of marine ecosystem that is often reliant on chemical energy and is independent of sunlight energy or photosynthetic producers
8. the area at the mouth of a river where its currents meet the ocean
10. the scale that is used to identify acids and bases
14. involves conserving and protecting something valuable such as the planet, its ecosystems and natural resources