Unit E

1. description of the variety of diffrent species in an ecosystem
6. daily changes in water level of the oceans
9. observe, check, or keep track of something for a specific purpose
10. characteristics used to describe a stream or river
13. large moving body of ice
15. the natural agent that stimulates sight and makes things visible
16. technigue for separating solutions that involves boiling and condensation
18. measure of the amount of substances besides water in a water sample
19. stream of water that moves within a larger body or water
21. water that is safe for humans to drink
23. group of organisms of the same species that live in a particular area
24. distance between the top or crest of one wave and the crest of the next year

2. eroded rock fragments and soil carried by water or wind
3. highest point of land on a continent
4. average weather measured over a long period of time
5. the area of seabed around a large landmass where the sea is relatively shallow compares with the open ocean
7. water containing a high concentration of calcium and magnesium
8. movement of water through a membrane from an area of lower water concentration to one of higher water concentration
11. also known as the foreshore and seashore and sometimes refferred to as the littoral zone, is the area that is above water at low tide and under water at low tide and under water at high tide
12. amount of dissolved salts in water
14. area of land that drains into one main lake or river
17. the degree or intensity of heat present in a substance or object, especially as expressed according to a comparative scale and shown by a thermometer
20. the tidal mouth of a river river, where the tide meets the stream
22. physical characteristic or behaviour of a species that increases the species' chances of survival in a particular environment