Chapter 12 - Multiple-Choice Questions 1) The P-wave shadow...

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Multiple-Choice Questions 1) The P-wave shadow zone is largely the result of __________. A) reflection of P waves from the inner core-outer core boundary B) lower P-wave velocities in the mantle than in the crust C) refraction of P waves crossing the mantle-outer core boundary D) reflection of P waves at the boundary between the inner and outer cores Answer: C Diff: 1 2) Which one of the following statements concerning Earth's magnetic field is true? A) At high latitudes, the force lines intersect Earth's surface at steep angles. B) Magnetic poles are not fixed and move freely across the Earth. C) Generated by magnetic, crystalline, iron grains in the outer core. D) Dipolar with the two poles centered near the equator. Answer: A Diff: 1 3) __________ are thought to be similar in composition to Earth's mantle. A) Shooting stars B) Metallic meteorites C) Cosmic gas clouds D) Stony meteorites Answer: D Diff: 1 4) The Earth's magnetic field originates by __________. A) weak electrical currents associated with hot, rising, mantle plumes B) magnetic mineral grains in the inner core C) weak electrical currents associated with fluid motions in the outer core D) magnetization of oxygen and nitrogen atoms in the atmospheric ozone layer by solar radiation Answer: C Diff: 1 5) The Earth's magnetic field __________. A) is a self-generating and self-reversing dynamo in the outer core B) is a high temperature superconductor in the inner core C) results from self-induction of rising magmas in the asthenosphere D) is a permanent field due to magnetized, iron-rich, mineral grains in the oceanic lithosphere Answer: A Diff: 1 For the following question (s), match the layers of the Earth with the appropriate description.
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A. inner core B. mantle C. crust D. outer core 6) _____ upper part of the lithosphere includes this layer Answer: C Diff: 1 7) _____ very dense, solidified, iron-rich alloy Answer: A Diff: 1 8) _____ Earth's magnetic field originates in this layer Answer: D Diff: 1 9) _____ transmits P waves but not S waves Answer: D Diff: 1 10) _____ the top of this layer is marked by the Mohorovicic discontinuity Answer: B Diff: 1 11) _____ includes the asthenosphere Answer: B Diff: 1 12) _____ includes large percentages of feldspars and quartz Answer: C Diff: 1 13) Which of the following best characterizes how the diameter of Earth's core and the nature of the outer core were discovered? A) Crystalline iron was found in lavas erupted from the deepest known hot spots. B) By analysis of the P-wave and S-wave shadow zones. C) Because P-wave speeds are higher in the outer core than in the lower mantle.
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This note was uploaded on 07/16/2009 for the course GEOL 100 taught by Professor Johntrib during the Spring '09 term at Maastricht.

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Chapter 12 - Multiple-Choice Questions 1) The P-wave shadow...

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