science

5. the amount of matter in a given space; mass per unit volume
7. A device that determines the distance of an object under water by recording echoes of sound waves
8. the tightness across the surface of water that is caused by the polar molecules pulling on one another
11. the quality of water that makes it able to dissolve more substances than any other solvent can
13. water that fills the cracks and spaces in underground soil and rock layers
16. the tendency of water to stick to other substances
17. small river or stream that flows into a large river or stream; a branch of the river
20. an underwater vehicle built of strong materials to resist pressure at depth

1. underground bed or layer yielding ground water for wells and springs etc
2. the area of land that is drained by a water system
3. organisms that live on the bottom of the ocean or other body of water; bottom-dwellers
4. Tiny algae and animals that float in water and are carried by waves and currents
6. The tendency of water molecules to stick to each other.
9. the movement of deep, cold, and nutrient-rich water to the surface
10. The amount of energy required to raise the temperature of 1 gram of a substance by 1 degree celcius...amount of heat required to increase the temperature of water
12. the area of the ocean beyond the edge of the continental shelf. Most diverse organisms live near the surface.
14. free-swimming animals that can move throughout the water column
15. spots on the ocean floor where hot gases and minerals escape from earth's interior into the water
18. the area drained by a river and its tributaries
19. the area where a freshwater stream or river merges with the ocean. Often a nursery for young.