16. What was Pangea? A. A genus of reptiles that ruled the world 150 million yea

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Question

16. What was Pangea?

A. A genus of reptiles that ruled the world 150 million years ago

B. A mountain chain that circled the globe 300 million years ago

C. A super continent proposed by Alfred Wegener that existed 250 million years ago

D. A type of highly iron rich magma found in trap lava eruptions

E. A deep dish pizza specialty from Sardinia

17. How are the organisms associated with mid-ocean ridges unusual?

A. They thrive on very low levels of photosynthesis

B. They have symbiotic relationships with deep-sea fish

C. Their average life span is over 500 years

D. They use chemicals as a source of energy

E. They eat dirt

18. Which is a true statement about magnetic reversals at divergent boundaries?

A. There are no magnetic reversals recorded in the oceanic crust

B. Since there have been no reversals in the last 50 million years, they can’t be seen

C. An identical sequence of reversals is found on either side of a mid-ocean ridge

D. The rock is too hot for reversals to be measured

E. All of the above

19. The importance of marine magnetic anomalies is that they:

A. Allow one to estimate the rate of plate divergence

B. Demonstrate the theory of seafloor spreading

C. Demonstrate that the Earth’s magnetic field reverses periodically

D. A, B and C

E. None of the above

20. How are hot spots produced?

A. Plumes of heat from the mantle

B. Sediments melting the uppermost crust

C. Seawater entering the volcano system

D. Compression melting of a thick slab

E. Plumes of melt from the mantle

16) A super continent proposed by Alfred Wegener that existed 250 million years ago

17)They use chemicals as a source of energy

18) An identical sequence of reversals is found on either side of a mid-ocean ridge

19) A, B and C

20) Plumes of melt from the mantle

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