Thomas' unit E crossword

1. to observe check or keep track of something for a specific purpose
4. all the area of land that drains into one main lake or river
8. the highest level that water will reach on shore
10. a description of a stream's characteristics
12. a movement on the surface of the water
14. water with a high concentration of calcium and magnesium
16. the highest part of land on a continent that determines the direction that a watershed flows
17. moving water from where there is a large quantity of it to where there is very little.
18. the laying down or depositing of sediments
19. water that can be drank safely
21. how pure water is
23. the average weather measured over a long period of time
24. the amount of salt dissolved in water
25. streams of water that move within a larger body of water

2. the process where salt water is forced through a semi permeable membrane that will only allow water to pass through
3. the regular rising and falling of large bodies of water
5. massive boulders that cannot be eroded creating something similar to a bullet proof vest for shorelines
6. the process where water is boiled so it leaves behind the other substances
7. the lowest point that the water will reach on shore
9. a group of organisms of the same species that live in a particular area
10. rock fragments and soil
11. large moving bodies of ice
13. the wearing away and transportation of sediments
15. the amount of water borne materials in a river
20. the variety of different kinds of organisms living in an ecosystem
22. a physical characteristic or behavior of a species