Choose the BEST answer from the available choices and record the corresponding letter on your SCANTRON computer grade form.

1. Initially, young basaltic rock at a mid-oceanic ridge has relatively low density. Therefore, oceanic ridges tend to be very positive features on the seafloor. However, eventually, _______ causes the rock's density to increase so that lithosphere of basaltic composition (i.e. oceanic plate margins) tends to subduct relatively easily.
[A] increasing pressure [B] decreasing pressure [C] increasing temperature [D] decreasing temperature

2. If you drilled deep into the seafloor below the Red Sea, you would probably encounter rock of _________ composition, because the Red Sea is a _______________ plate boundary.
[A] granitic; oceanic-oceanic divergent [B] basaltic; oceanic-oceanic divergent [C] granitic; continental-continental divergent [D] basaltic; oceanic-oceanic convergent

3. A few million years before the "docking" of the Indian subcontinent with Asia -- and the later development of the Himalayas -- a ______ would have existed between these two landmasses.
[A] continental rift [B] mid-oceanic ridge system [C] subduction zone [D] transform boundary [E] both B & C

4. The average age of continental crust is many times that of oceanic crust. According to plate tectonic theory, a difference in plate ________ results in vastly different rates of _________ for these crustal types, and therefore accounts for this major discrepancy.
[A] spreading rates; rifting [B] density; rifting [C] density; subduction [D] spreading rates; subduction

5. According to plate tectonic theory, mobile plates move over a layer within the mantle called the:
[A] transform zone   [B] lithosphere   [C] asthenosphere   [D] rift zone

6. Which of the following IS NOT directly produced by seafloor spreading?
[A] mid-oceanic ridges   [B] transform faulting  [C] plate subduction   [D] the lithosphere

7. There is abundant evidence that the New Madrid Fault Zone -- along Tennessee's western border -- is an ancient rift valley that failed to develop into a mature spreading center. Had this rift not failed, today West TN would probably be the site of a(n):
[A] deep ocean trench   [B] coastline   [C] continental volcanic arc   [D] volcanic island arc [E] both A & D

8. By definition, a passive continental margin is a coastline where there is not an active plate boundary in the vicinity. Based on a plate boundary map (see your textbook), which of the following is BEST described as a passive continental margin?
[A] South America's west coast   [B] North America's east coast   [C] Asia's eastern coast   [D] North America's west coast [E] both B & D

9. Continental crust along plate margins will not _______ because of its comparitively _______.
[A] rift, great thickness [B] subduct, great thickness [C] rift, low density [D] subduct, low density  [E] subduct, great thickness and low density

10. At an oceanic-continental convergent plate boundary, which of the following develops?
[A] new seafloor   [B] subduction zone   [C] volcanic island arc   [D] continental volcanic mountain arc    [E] both B & D