Explain why earthquakes at subduction zones are many times more powerful than at spreading-center earthquakes

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Which two locations in Figure 1 are most likely to move closer together over time

 

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Use the map view in Figure 1 to answer questions 1 through 6.

map

 

1.Which of the following locations is a transform plate boundary?

A. K

B. O

C. S

D. T

E. W

Put arrows on either side of the transform plate boundary to show the motion of the plates at this boundary (if you don’t print out the map, you can just recreate the part of it that has the transform in it and show the motion on your recreated sketch).

 

What kind of stress dominates this plate

boundary: tensioncompressionor shear?

 

2.What kind of plate boundary does O lie on?

A. divergent

B. transform

C. convergent – subduction zone

D. convergent – collison zone

 

Explain how the plates move on either side of this plate boundary.

 

What kind of stress dominates this plate

boundary: tension, compression, or shear?

 

3.At which of the following locations are you most likely to find the oldest rock on this map?

A.  D

B. J

C. K

D. P

E. S

EXPLAIN YOUR ANSWER

 

4.Where would you expect to see the highest heat flow?

A.  D

B. H

C. M

D. R

E. S

Why would you expect high heat flow here?

 

5. Which two locations in Figure 1 are most likely to move closer together over time?

A.  D andH

B. H andM

C. M and R

D. R and J

E. J and L

EXPLAIN YOUR ANSWER

 

6.How many plates are present on this map?

A. 2

B. 3

C. 4

D. 6

E. 7

 

7.At an ocean-continent convergent plate boundary, it is always the plate containing oceanic crust that is recycled (subducted) back into the mantle.  Why can’t continents be subducted?

 

8.Completely describe the aesthenosphere.  What is the basic important difference between the asthenosphere and the lithosphere?

 

9.Answer Question for Review #15 on p.49 of your textbook (or p.48 in the older 8th edtion): Describe a deep sea trench.  How does one form?

 

10.Explain why earthquakes at subduction zones are many times more powerful than at spreading-center earthquakes.

 

 
 

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