2. The San Andreas Fault represents the break between the

Northwest American and Pacific Plates.
North American and Great Western Pacific Plates.
North American and Pacific Plates.
American and Pacific Plates.

3. Which of the following is not true concerning general information about plates?

Plate boundaries are not the same as continental boundaries.
Many plates contain both continental and oceanic crustal material.
The thickness of all plates is very uniform.
There are about a dozen large plates and several smaller ones.

4. The Red Sea is on a

divergent boundary and should grow somewhat wider with time.
transitional boundary and should grow larger with time.
divergent boundary that will change to a subduction zone in a relatively short amount of time.
transitional boundary that will change to a subduction zone in time.

5. Choose the incorrect statement about plate interactions

Plates are growing at divergent boundaries but getting smaller at the trenches.
Plates are growing at oceanic ridges but getting smaller at convergent zones.
Plates are growing at oceanic ridges but getting smaller at subduction zones.
Plates are growing at divergent zones but getting smaller at transform boundaries.

6. The result of an oceanic plate converging with an oceanic plate is a

large volcanic mountain chain like an oceanic ridge in structure and composition.
collision zone that can create mountains.
volcanic string of islands.
volcanic string of islands composed mainly of rhyolite-type rock with some andesite.

7. The result of an oceanic plate converging with a continental plate is a

volcanic mountain chain like the Cascade Range in Oregon and Washington.
collision zone that can create mountains.
volcanic mountain chain much like an oceanic ridge in structure and composition.
volcanic mountain chain composed of basaltic rock only.

8. The result of a continental plate converging with a continental plate is a

volcanic mountain chain like the Andes Mountains.
collision zone that creates mountains.
collision zone that can create volcanic mountains composed mainly of basalt.
collision zone that can create volcanic mountains like the Cascade Range.

9. Convergence of plates often involves

subduction, trench formation and volcanic activity.
subduction, trench formation and oceanic ridge formation.
subduction, oceanic ridge formation and backarc spreading.
collision, trench formation and oceanic ridge formation.

10. Oceanic crust always subducts beneath continental crust because it

is heavier and hotter.
is denser and thinner.
is denser and hotter.
sinks to form trenches.

11. The descent of a subducting plate can be followed most readily by the

increase in heat liberated by friction.
increase in pressure exerted on the rock as it goes deeper.
earthquake activity along the plate as it descends.
melting of rock along its edge as it descends.

12. The interaction of two converging oceanic plates creates

a string of islands made of andesite, while the interaction of an oceanic and continental plate creates a volcanic mountain chain made of basalt.
creates a string of islands made of basalt, while the interaction of an oceanic and continental plate creates a volcanic mountain chain made of andesite.
creates a string of islands made of andesite similar to the volcanic mountain chain created by the interaction of oceanic and continental plates.
creates a trench, while the interaction of oceanic and continental plates creates a volcanic mountain chain made of basalt.

13. Choose the correct statement concerning the strength of earthquakes.

Earthquakes tend to be more powerful at convergent boundaries than at divergent boundaries.
Earthquakes tend to be more powerful at convergent boundaries than in subduction zones.
Earthquakes tend to be more powerful at divergent boundaries than at transform boundaries.
Earthquakes tend to be more powerful at divergent boundaries than at convergent boundaries.

14. Transform faults form

some plate boundaries and are found only on the ocean floors.
some plate boundaries and are found on continents and on the ocean floor.
some plate boundaries and are found only on continents.
along the exact edges of continents and are therefore found on the continent or ocean floor.

15. Which of the following is true concerning the lithosphere?

It is about 100km thick and consists of oceanic crust which is the partially molten uppermost mantle.
It is about 100km thick and is made up of crustal rock only.
It is about 100km thick and rests upon a rigid layer in the uppermost mantle.
It is about 60 miles thick and "floats" on a partially molten layer.

16. Convection is probably caused from uneven heating in the

lithosphere due to residual heat from accretion and radioactive elements in rock.
mantle due to residual heat from accretion and radioactive elements in rock.
mantle due to the rapid transfer of heat from the hotter core.
lithosphere due to the rapid transfer of heat from the hotter mantle.

17. Convection may move plates by

pushing them apart only.
pulling them apart only.
pushing them apart or pulling them apart.
pulling them upwards as the rock convects sideways.

18. The portion of mantle convection that moves upward towards the surface tends to create

oceanic ridges and downward convection creates trenches.
oceanic ridges and downward convection creates ocean basins.
volcanic mountains on continents and downward convection creates trenches.`
trenches and downward convection creates volcanic islands.

19. The Two Tiered Boundary Layered Theory of Convection proposes that

two general sets of convection currents occur in the mantle; one under contiments, the other under ocean basins.
shallow convection occurs above a 220km depth and larger convection currents form in the deeper mantle.
shallow convection occurs above a depth of approximately 700km and larger convection currents form in the deeper mantle.
two general sets of convection currents occur in the mantle; one forms plumes the other moves plates.

20. Mantle plumes seem to be

large portions of molten plates that rise to form volcanic islands in the ocean and volcanic mountains on continents.
large portions of molten plates that rise to form volcanic islands in the ocean and "hot spots" on continents.
convection currents that rise to form volcanic islands and trenches in the ocean basins.
deep convection currents that can form volcanic islands in the oceans and "hot spots" on continents.

Prepared by: Mike Mitchell

Be sure to review your quizzes befor taking the test.