Question 1

The __________ is the hot, weak, and plastic uppermost portion of the mantle.

Accepted Answer

asthenosphere

Question 2

At a convergent boundary, asthenosphere rock oozes upward to fill the gap between separating plates.

Accepted Answer

A) True 
 B)False  False

Question 3

A single plate can carry both oceanic and continental crust.

Accepted Answer

A) True 
 B)False  True

Question 4

The Earth's __________ is about 2,900 kilometers thick.

Accepted Answer

The answer of The Earth's __________ is about 2,900 kilometers...

Question 5

At a transform boundary:

Accepted Answer

A)  one plate subducts into the mantle. 
B)  a Mid-Oceanic Ridge forms. 
C)  two plates slide horizontally past each other. 
D)  earthquakes are rare. 
A)  one plate subducts into the mantle. 
B)  a Mid-Oceanic Ridge forms. 
C)  two plates slide horizontally past each other. 
D)  earthquakes are rare.

Question 6

The mantle makes up about __________ percent of the Earth's volume.

Accepted Answer

A)  8 
B)  80 
C)  20 
D)  0.8 
A)  8 
B)  80 
C)  20 
D)  0.8

Question 7

A/an __________ __________ is a long narrow trough in the sea floor formed where a portion of an oceanic plate sinks into the mantle.

Accepted Answer

The answer of A/an __________ __________ is a long narrow...

Question 8

Alfred Wegener realized that:

Accepted Answer

A)  the African and South American coastlines fit together like pieces of a jigsaw puzzle. 
B)  Africa and South America must have once been one continent. 
C)  there must have been one big supercontinent that he named Pangea. 
D)  all of the above 
A)  the African and South American coastlines fit together like pieces of a jigsaw puzzle. 
B)  Africa and South America must have once been one continent. 
C)  there must have been one big supercontinent that he named Pangea. 
D)  all of the above

Question 9

If two converging plates are both covered with oceanic crust, subduction will occur.

Accepted Answer

A) True 
 B)False

Question 10

The asthenosphere is:

Accepted Answer

A)  hot, weak, and plastic. 
B)  mostly liquid magma. 
C)  composed mostly of sedimentary rocks. 
D)  hard, strong rock. 
A)  hot, weak, and plastic. 
B)  mostly liquid magma. 
C)  composed mostly of sedimentary rocks. 
D)  hard, strong rock.

Question 11

Vertical movement in the lithosphere occurs due to:

Accepted Answer

A)  mantle plumes. 
B)  hot spots. 
C)  isostatic adjustment. 
D)  mantle convection. 
A)  mantle plumes. 
B)  hot spots. 
C)  isostatic adjustment. 
D)  mantle convection.

Question 12

Alfred Wegener named the northern part of the supercontinent __________ consisting of what is now North America and Eurasia.

Accepted Answer

A)  Pangea 
B)  Laurasia 
C)  Gondwanaland 
D)  Arctica 
A)  Pangea 
B)  Laurasia 
C)  Gondwanaland 
D)  Arctica

Question 13

Reversed magnetic polarity is the opposite of the Earth's current magnetic field.

Accepted Answer

A) True 
 B)False

Question 14

The Hawaiian Island chain is an example of a volcanic center at a __________ __________.

Accepted Answer

The answer of The Hawaiian Island chain is an example...

Question 15

Supercontinents may assemble, split apart, and reassemble every 5,000 to 7,000 years.

Accepted Answer

A) True 
 B)False

Question 16

The __________ __________ is the undersea mountain chain located halfway between North and South America to the west, and Europe and Africa to the east.

Accepted Answer

The answer of The __________ __________ is the undersea mountain...

Question 17

Magnetic orientation in rocks that is opposite to the current orientation of Earth's magnetic field is called __________ magnetic polarity.

Accepted Answer

A)  normal 
B)  reversed 
C)  regular 
D)  irregular 
A)  normal 
B)  reversed 
C)  regular 
D)  irregular

Question 18

The asthenosphere is a rigid, brittle rock layer.

Accepted Answer

A) True 
 B)False

Question 19

The Mid-Oceanic Ridge is elevated above the surrounding sea floor because it is:

Accepted Answer

A)  made of the oldest, coolest, and most dense lithosphere. 
B)  made of the newest, hottest, and lowest-density lithosphere. 
C)  full of gas bubbles. 
D)  very old. 
A)  made of the oldest, coolest, and most dense lithosphere. 
B)  made of the newest, hottest, and lowest-density lithosphere. 
C)  full of gas bubbles. 
D)  very old.

Question 20

The Earth's outer core is:

Accepted Answer

A)  cool and brittle. 
B)  composed of helium. 
C)  molten because the pressure is very high. 
D)  as hot as the surface of the Sun. 
A)  cool and brittle. 
B)  composed of helium. 
C)  molten because the pressure is very high. 
D)  as hot as the surface of the Sun.

Exam 6: The Active Earth: Plate Tectonics

The __________ is the hot, weak, and plastic uppermost portion of the mantle.

At a convergent boundary, asthenosphere rock oozes upward to fill the gap between separating plates.

A single plate can carry both oceanic and continental crust.

The Earth's __________ is about 2,900 kilometers thick.

At a transform boundary:

The mantle makes up about __________ percent of the Earth's volume.

A/an __________ __________ is a long narrow trough in the sea floor formed where a portion of an oceanic plate sinks into the mantle.

Alfred Wegener realized that:

If two converging plates are both covered with oceanic crust, subduction will occur.

The asthenosphere is:

Vertical movement in the lithosphere occurs due to:

Alfred Wegener named the northern part of the supercontinent __________ consisting of what is now North America and Eurasia.

Reversed magnetic polarity is the opposite of the Earth's current magnetic field.

The Hawaiian Island chain is an example of a volcanic center at a __________ __________.

Supercontinents may assemble, split apart, and reassemble every 5,000 to 7,000 years.

The __________ __________ is the undersea mountain chain located halfway between North and South America to the west, and Europe and Africa to the east.

Magnetic orientation in rocks that is opposite to the current orientation of Earth's magnetic field is called __________ magnetic polarity.

The asthenosphere is a rigid, brittle rock layer.

The Mid-Oceanic Ridge is elevated above the surrounding sea floor because it is:

The Earth's outer core is:

Earth Systems

Minerals

Rocks

Geologic Time: a Story in the Rocks

Geologic Resources

Earthquakes and the Earths Structure

Volcanoes and Plutons

Mountains

Weathering, Soil, and Erosion

Fresh Water: Streams, Lakes, Ground Water, and Wetlands

Water Resources

Glaciers and Ice Ages

Deserts and Wind

Ocean Basins

Oceans and Coastlines

The Atmosphere

Energy Balance in the Atmosphere

Moisture, Clouds, and Weather

Climate

Climate Change

Motions in the Heavens

Planets and Their Moons

Stars, Space, and Galaxies

Filters

A/an is a long narrow trough in the sea floor formed where a portion of an oceanic plate sinks into the mantle.

The Hawaiian Island chain is an example of a volcanic center at a .

The is the undersea mountain chain located halfway between North and South America to the west, and Europe and Africa to the east.