1. Why do magnetic variations help us understand plate tectonics?
 
 
 

2.   Why are earthquakes most likely to occur on pacific coastline?
 
 
 
 
 

3.  As the earth gets older, what will happen in terms of tectonic activity and mountain building?
 
 
 
 

4.  Near the crest of the mid-ocean ridge rocks are younger than far from the ridge.  Why?
 
 
 
 
 
 

5.  If you were a scientist today, what question would you like to answer about plate tectonics?