11. Where is continental crust the thickest? A. Underneath tall mountain ranges
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Question
11. Where is continental crust the thickest?
A. Underneath tall mountain ranges
B. Underneath continental shelves
C. Underneath transform faults
D. Underneath trenches
E. A and C
12. In 1912 Alfred Wegener proposed the idea of continental drift, which of the following information did he NOT use as evidence for continental drift?
A. Similar rock formations in mountain chains on different sides of oceans
B. Glacial formations on different continents
C. Identical fossil reptile species found in Africa and South America
D. Magnetization of accretionary prism rocks
E. All of the above
13. Continental Drift is thought to be the predecessor of modern Plate Tectonic Theory. What was missing from Wegener’s theory?
A. Data
B. Knowledge of Earth’s rotation
C. A driving mechanism
D. Knowledge of the interior of the Earth
E. None of the above
14. What data were used for evidence of apparent polar wander?
A. Magnetism
B. Seismicity
C. Gravity
D. Seafloor Magnetic Anomalies
E. Paleo-poles derived from rock magnetism
15. Which of the following is NOT true regarding the Earth’s magnetic field?
A. The magnetic field is recorded in many rocks when they form
B. Reversals of the field are not global events
C. The field results from fluid motions in the outer core
D. The field reverses periodically
E. The inclination at the poles is vertical
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
Explanation / Answer
11) under tall mountainranges
12) magnetization of accretionary prism rocks
13) A driving mechanism
14) Paleo-poles derived from rock magnetism
15) Reversals of the field are not global events
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