hydrosphere

2. valuable water resource on Earth; provides drinking water
3. the area at the mouth of a river where its current meets the ocean; contains brackish (part fresh, part salt) water; acts as a marine habitat, buffer for pollutants, filter to remove run off pollution, and breeding ground/nursery area for aquatic organisms
6. 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
8. a measure of how suitable water may be for drinking
9. 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 of the ecosystem
11. any substance below 7 on the pH scale
13. the scale that is used to identify acids and bases (ranges from 0-14); acids are below 7, bases are above 7, neutral is equal to 7
16. cycling of water (H2O) on Earth through a variety of processes
17. type of marine ecosystem that relies on algae to act as producers and provide the majority of energy for the food chain; the majority of the world's oxygen is produced in this ecosystem
18. a liquid that dissolves substances called solutes
21. cloudy or opaque; due to stirred up sediment or particles in the water

1. oxygen found in a body of water; measurements may be used to indicate the degree of health of the water
4. involves conserving and protecting something valuable, such as the planet, its ecosystems and natural resources
5. type of marine ecosystem that is often reliant on chemical energy and is independent of sunlight energy or photosynthetic producers
7. all the water on or surrounding the surface of the planet (oceans,lakes,rivers,water in the atmosphere
10. any substance above 7 on the pH scale
12. the area of land drained by a river and its branches
14. underground rock layer that contains a vital source of water for human consumption and use
15. the process of purifying or clarifying water to make it more potable
19. the area of land where surface water drains when the ground is unable to absorb it
20. refers to the amount of salt contained within a solution