Crises Exam 1 '10A

Crises Exam 1 '10A - CRISES OF A PLANET GEOL 108 Midterm 1...

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CRISES OF A PLANET - GEOL 108 September 21, 2010 Midterm 1 – VERSION A Maximum Points = 300 A. TRUE/FALSE (2 points each) Designate which statements are TRUE or FALSE by filling in the A (true) or B (false) blank on the SCANTRON answer sheet. 1. Heating of the inner portions of Earth result from fusion of hydrogen atoms. 2. Other than trace amounts of He, early planet Earth had no atmosphere at the time of its formation. 3. The terrestrial planets, including Mercury, Venus, Earth and Mars, are enriched in iron, magnesium, silicon, and oxygen relative to the larger more distant planets. 4. The age of light coming to earth from the most distant regions of the universe dates back to about 12 to 14 b.y. ago, the estimated age of the "Big Bang". 5. The Solar System is expanding today. 6. Water on planet Earth initially arrived from comets. 7. Without radioactivity the Earth, would be a dead planet. 8. Island arcs result from convergence of two ocean plates. 9. Early earth destroyed its crust much like is occurring in the oceans today. 10. Ocean crust is youngest at the ocean ridges where it is formed and becomes progressively older with distance from the ridge. 11. Primary waves cause the first shaking in an earthquake 12. Transform faults connect ends of offset ocean ridges. 13. Pangea formed from a number of continental collisions leading to the formation of the Sierra Nevada and San Gabriel Mountains. 14. Rifting of Pangea resulted in the formation of Laurasia and Gondwanaland. 15. The present site of the Ural Mountains represents the demise of a long-lost ocean basin. 16. The San Andreas fault is a boundary between the North American and Pacific plates, the latter presently moving northward toward the Aleutian trench. 17. The fluid motion of the outer core is the cause of the Earth's magnetic field. 18. The Earth's early atmosphere resulted from volcanic activity. 19. Convergence of two ocean plates leads to the construction of island arcs such as the Aleutians, the Tonga Islands, and Japan. 20. Most of the Earth's seafloor has been recycled back into the mantle. 21. As early as 1911, Alfred Wegener presented ideas about sea floor spreading. 22. Ocean crust is primarily comprised of basalt and related igneous rocks. 23. Pahoehoe is a Hawaiian term applied to pyroclastic basalt eruptions. 24. The port town of St. Pierre, on the Caribbean Island of Martinique, was destroyed by a nuee ardente. 25. Ocean crust melts during subduction forming andesite magma, the dominant volcanic rock of island arcs. 26. Andesite magma is a more viscous liquid than that of basalt because it contains more silica and is at a lower temperature. 27. Volcanic activity of the Cascade Mountain Range of the Pacific Northwest results from continental collision 28. Valley widening primarily occurs by mass wasting. 29. Rock debris at the bottom of a rock fall is known a talus.
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This note was uploaded on 01/05/2011 for the course GEOL 108 at USC.

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Crises Exam 1 '10A - CRISES OF A PLANET GEOL 108 Midterm 1...

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