Unit E rodas 8sch

4. in an ecosystem means different variety of species
7. contains a high concentration of calcium and magnesium
8. microscopic plants that are food for fish in the top and middle zones of most lakes
13. movement of water through a membrane from an area of lower water concetration to one of higher water concentration
16. highest point of the continent
17. one of the many ways humans use earths water supplies
19. the total amount of all salts dissolved in water
21. the average weather measured over a long period of time
22. observe or keep track of something

1. the area of land that drains into one main lake or river
2. water that is safe to drink
3. physical characteristics or behaviour of a species
5. characteristics used to describe a stream or river
6. eroded rock fragments and soil carried by water or wind
9. streams of water that move within a larger body of water
10. composed of fine sediment particles suspended and transport through the stream
11. boiling bad salt
12. group of organisms that live in the same area
14. describes how pure the water is
15. change in water level
18. large moving bodies of ice
20. changes in pattern that move along the water surface