The Solid Earth - Chapter 6: Pangaea

Question 1

____ dating helped Dietz and Holden reconstruct the time frame for the formation and breakup of Pangaea

Answer 1

radiometric

Question 2

The fragmentation of Pangaea began about ____ years ago

Answer 2

200 million

Question 3

True or false: Pangaea is the only example of a fragmentation of the continents

Answer 3

False

Question 4

What is the underlying driving force for plate tectonic movement?

Answer 4

Unequal distribution of heat within the earth

Question 5

Large ____ currents within the mantle drive plate motion

Answer 5

Convection

Question 6

The warm, less dense material of the mantle rises very slowly in the regions of oceanic regions. As the material spreads laterally, it drags the ___ along

Answer 6

lithosphere

Question 7

Eventually after cooling, the mantle material sinks back into the mantle where it is ____

Answer 7

reheated

Question 8

As a newly formed slab of oceanic crust moves away from the ridge crest, it gradually cools and becomes ____

Answer 8

denser

Question 9

When does the oceanic slab become cold enough to descend?

Answer 9

When it becomes denser than the asthenosphere

Question 10

True or false: the slab push and slab pull model have no base in truth

Answer 10

False