Ch. 17
Applying the Concepts

<See the back of the chapter.>

Questions for Thought
 
 3. 	The water table is the boundary between the zone of saturation and the zone above it. 

A hole that is drilled to the water table is a well.  Holes not drilled this far are not wells and do not have groundwater collect in them. Water only accumulates in the portion of the 
	well below the water table.

 6. 	Possible ways of extending the freshwater supply include (1) recycling wastewater (2) desalinating water from the ocean (3) One of the more radical ideas is to tow icebergs from the polar regions to regions that need water. (4) Conservation is an easily applied method to stretch existing water supplies.

 7. 	Natural processes remove dissolved materials as quickly as the rivers add them.  Calcium and silicon are removed by plants and animals to make solid shell, bones, and other hard parts.  Other dissolved minerals form solid deposits directly and also make sediments that settle to the ocean floor. These solid deposits and the hard parts of animals and plants are recycled into Earth's interior along with the solid sediments deposited by rivers.

 9. 	Waves refract into shallow water causing the waves to approach the shore head-on.  The part of the wave in the shallower portion refracts because it is traveling slower than the rest of the wave. The circular motion of the water particles reaches the bottom when the depth is about half a wavelength, and friction with the bottom is what slows the shallower end of the wave. This slowdown allows the part of the wave farther from shore to catch up and forces the wave to become parallel to the shore.

 2. T
 3. F
 4. F
 6. F
 7. F
 8. T
 9. T
10. F
11. d
12. b
13. a
14. d
15. d
16. b
17. d
20. b
23. b
24. c
25. a
28. b
29. c
30. d