Question 1

The magnetic dip preserved in a rock indicates

Accepted Answer

A)  How far east or west of north the rock crystallized. 
B)  The rock's magnetic latitude at the time that it - crystallized. 
C)  How deep in the crust the magma crystallized. 
D)  How far from a spreading ridge the rock has traveled.

Question 2

Rifting occurs at oceanic spreading ridges,but not within continents,because continents are so thick and strong.

Accepted Answer

A) True 
 B)False

Question 3

With increasing distance from an oceanic ridge,

Accepted Answer

A)  The rocks become older. 
B)  The rocks become younger. 
C)  The rocks' ages alternate between younger and older. 
D)  All of the choices; different patterns occur at different ridges.

Question 4

The Appalachian Mountains of eastern North America were formed by continent-continent collision.Today,these mountains are still being uplifted by the same type of collision

Accepted Answer

A)  The Andes Mountains of South America. 
B)  The Cascade Mountains of North America. 
C)  The Rocky Mountains of North America. 
D)  The Himalaya Mountains of Asia.

Question 5

Hot spots

Accepted Answer

A)  Move along with plates. 
B)  Can exist under both oceans and continents, but remain stationary as the plate above moves. 
C)  result in extrusion of volcanic rocks. 
D)  Both b and c are correct.

Question 6

The strength of a rock

Accepted Answer

A)  May depend on how long it has been subjected to stress. 
B)  Varies with the kind of stress (compressive, tensile or shearing). 
C)  May be reduced by weathering or fracturing. 
D)  All of the choices are correct.

Question 7

The asthenosphere is a weak,locally partly molten layer over which lithospheric plates can move.

Accepted Answer

A) True 
 B)False

Question 8

A ductile material is one that

Accepted Answer

A)  Resists deformation under stress. 
B)  Conducts electricity well. 
C)  Readily undergoes plastic deformation. 
D)  Ruptures easily under stress.

Question 9

The earth's polarity has remained the same since its existence.

Accepted Answer

A) True 
 B)False

Question 10

Transform faults that offset segments of a spreading ridge are formed because rates of spreading are not constant along any one rift zone so shearing develops when one segment grows faster than another.

Accepted Answer

A) True 
 B)False

Question 11

Rocks may behave differently over the long spans of geologic time than they do in short-term laboratory experiments.

Accepted Answer

A) True 
 B)False

Question 12

The San Andreas fault is a good example of a

Accepted Answer

A)  Convergent plate boundary. 
B)  Divergent plate boundary. 
C)  Transform plate boundary. 
D)  Hotspot.

Question 13

The best explanation for the distribution of Glossopteris and Mesosaurus is that they lived when continents on which their fossils are now found were once connected then later were rifted and drifted apart.

Accepted Answer

A) True 
 B)False

Question 14

Example of the movement of the following plates: continent-ocean; continent-continent; ocean-ocean is best referred to as the

Accepted Answer

A)  Divergent plate boundary. 
B)  Transform plate boundary. 
C)  Constructive plate boundary. 
D)  Convergent plate boundary.

Question 15

Divergent plate boundaries

Accepted Answer

A)  Always result in rifts along which new oceanic crust is created. 
B)  May result in rifts on continents, but may also "fail" or stop, resulting in topographically low areas. 
C)  Are no longer a potential hazard if they are not actively rifting. 
D)  Are simple curvilinear features on all ocean floors.

Question 16

Because the sea floor is protected from weathering,seafloor rocks are better preserved and generally older than continental rocks.

Accepted Answer

A) True 
 B)False

Question 17

The idea of continental drift was not proposed until the 1960s,when the first evidence to support it was discovered.

Accepted Answer

A) True 
 B)False

Question 18

A possible "driving force" for plate motions is

Accepted Answer

A)  Volcanic eruption at hot spots. 
B)  Shifts in the earth's magnetic field. 
C)  Convection in the asthenosphere. 
D)  The weight of subducted continents pulling downward.

Question 19

Seawater interacting with hot sea floor at spreading ridges may produce mineral deposits.

Accepted Answer

A) True 
 B)False

Question 20

Continental drift may explain evidence of past glaciation in regions now located in the tropics,because local climate is strongly controlled by latitude.

Accepted Answer

A) True 
 B)False

Exam 3: Plate Tectonics

The magnetic dip preserved in a rock indicates

Rifting occurs at oceanic spreading ridges,but not within continents,because continents are so thick and strong.

With increasing distance from an oceanic ridge,

The Appalachian Mountains of eastern North America were formed by continent-continent collision.Today,these mountains are still being uplifted by the same type of collision

Hot spots

The strength of a rock

The asthenosphere is a weak,locally partly molten layer over which lithospheric plates can move.

A ductile material is one that

The earth's polarity has remained the same since its existence.

Transform faults that offset segments of a spreading ridge are formed because rates of spreading are not constant along any one rift zone so shearing develops when one segment grows faster than another.

Rocks may behave differently over the long spans of geologic time than they do in short-term laboratory experiments.

The San Andreas fault is a good example of a

The best explanation for the distribution of Glossopteris and Mesosaurus is that they lived when continents on which their fossils are now found were once connected then later were rifted and drifted apart.

Example of the movement of the following plates: continent-ocean; continent-continent; ocean-ocean is best referred to as the

Divergent plate boundaries

Because the sea floor is protected from weathering,seafloor rocks are better preserved and generally older than continental rocks.

The idea of continental drift was not proposed until the 1960s,when the first evidence to support it was discovered.

A possible "driving force" for plate motions is

Seawater interacting with hot sea floor at spreading ridges may produce mineral deposits.

Continental drift may explain evidence of past glaciation in regions now located in the tropics,because local climate is strongly controlled by latitude.