Ch. 14
Applying the Concepts

<See the back of the chapter.>

Questions for Thought
 
 3. 	Information about the core is obtained from seismological data, or earthquake waves that pass through the core; the nature of meteorites, which give information as to the relative abundance of materials in the nebula that condensed to form the planet; and geological data at the surface of the Earth.

 6. 	The seafloor is new crust that is created in the ridges. Older seafloor is plowed under at the edges of continents in subduction zones to re-melt and possibly migrate back to the spreading ridge. Therefore, all the ancient rock has already been pushed into a subduction zone in this recycling process.

 7. 	Divergent boundaries occur between two plates moving away from each other. New crust is formed at these boundaries.  Convergent boundaries occur between two plates moving toward one another.  This is where crust is destroyed to make room for the newly created crust at the divergent boundaries. Transform boundaries occur between plates sliding by each other. Crust is not created or destroyed in these regions; however, many earthquakes are caused by sudden jerks at these boundaries.

10. 	The most probable source of earthquakes in southern California is the San Andreas Fault, which is a transform boundary between the Pacific Plate and the North American Plate. If the plates stick together for a time, then violently break apart, an earthquake occurs.

<Attached Questions>

 1.  F
 2.  T
 3.  T
 4.  F
 5.  F
 6.  T
 7.  F
 8.  F
 9.  T
10.  F
11.  a
12.  c
13.  d
14.  c
15.  a										
16.  d
17.  c
18.  a
19.  d
20.  b
21.  d
22.  c
23.  a
24.  b
25.  d
26.  c
27.  b
28.  b
29.  a
30.  c