The Solid Earth - Chapter 6: Testing the Model

Question 1

What is the most persuasive evidence of plate tectonics?

Answer 1

The magnetic field associated with earth

Question 2

The two poles of the earth’s magnetic fields

Answer 2

north

south

Question 3

Invisible lines of ____ pass through the earth and extend from one pole to the other

Answer 3

force

Question 4

The point at which a heated magnetic mineral loses magnetism

Answer 4

Curie point

Question 5

When iron rich grains cool below their Curie point, they become magnetized in the direction parallel to the _____

Answer 5

existing magnetic field

Question 6

True or false: once the minerals solidify after cooling below Curie Point, the magnetism they possess will remain “frozen” in this position

Answer 6

true

Question 7

True or false: rocks “remember” the location of the magnetic poles at the time of their formation and are said to possess fossil magnetism

Answer 7

True

Question 8

The name for fossil magnetism

Answer 8

paleomagnetism

Question 9

Where was early evidence of polar wandering found (AKA in what context)?

Answer 9

Scientists found that lava flows with iron content of different ages tended to have varied magnetic alignment

Question 10

True or false: the plate tectonics theory could explain pole wandering

Answer 10

True

Question 11

True or false: the earth’s magnetic field periodically reverses polarity

Answer 11

true

Question 12

When rocks exhibit the same magnetism as the present magnetic field they are said to possess ___ polarity

Answer 12

normal

Question 13

Rocks that display the opposite magnetism to the current field have ____ polarity

Answer 13

reverse

Question 14

In the plate tectonics model, what are produced where cold dense slabs of oceanic lithosphere plunge into the mantle?

Answer 14

Deep ocean trenches

Question 15

As the slab descends further into the asthenosphere, ____ earthquakes are generated

Answer 15

deeper focus

Question 16

True or false: the absence of deep focus earthquakes along divergent boundaries and transform faults supports the theory of plate tectonics

Answer 16

True

Question 16

True or false: the absence of deep focus earthquakes along divergent boundaries and transform faults supports the theory of plate tectonics

Answer 16

True

Question 17

What did the Glomar Challenger find about the microorganisms in the sediment in their drill sites?

Answer 17

The age of the sediment increased with increasing distance from the ridge.

Question 18

What is the name of the ship that is more modern than and carries on the work of the Glomar Challenger?

Answer 18

JOIDES Resolution

Question 19

Researchers have proposed that a rising plume of mantle material is located below the island of Hawaii. Melting of this hot rock as it enters the low pressure environment near the surface generates a volcanic area called…

Answer 19

hot spot

Question 20

The age of each volcano in a hot spot indicates the time when it was situated over the relatively stationary ______

Answer 20

mantle plume

Question 21

Where is an excellent example of hot spots?

Answer 21

Hawaii