Lesson 4.2 : Earth's Waters

4. the largest reservoir.
7. a fresh water found in the rock and soil layers beneath the surface.
8. the largest ocean in the world.
10. a natural event wherein an area that is usually dry is submerged under water.
12. consists of relatively warm,low-density water,extends from the ocean surface to a depth of 100m.
15. the saltiness of saltwater.
16. a clearly-defined passageway.
17. large inland bodies of fresh or saline water.
19. adds water, causing dilution.
20. the line that separates individual drainage basin.

1. is a moving body of surface water that flows downslope toward a sea lelevel because of gravity.
2. Land areas where water covers the surface for significant periods.
3. where the temperature is uniformly low.
5. a permanent body of ice.
6. most of the permafrost found.
9. stored in glaciers and ice sheets.
11. a soil,rock,or sediment that is frozen for more than two consecutive years.
13. the average length of time spent by water molecule in a reservoir.
14. where the temperature of water decreases rapidly with depth.
18. the narrow,elongated landform separating individual streams within a basin.