Crises Exam 1 '08

Crises Exam 1 '08 - Midterm1 September23,2008...

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CRISES OF A PLANET - GEOL 108 September 23, 2008 Midterm 1 Maximum Points = 282 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. The age of light coming to earth from the most distant regions of the universe dates back to about 12 to 14 million years ago, the estimated age of the "Big Bang". 2. The Earth never experienced the same heavy meteorite cratering of its moon because most of the incoming meteorites were burned up in the thick atmosphere. 3. Heating of the inner portions of Earth result from fusion of hydrogen atoms. 4. Excluding the effects of immigration, the 1995 U.S. population growth rate of 0.69 % indicates that the country’s population was decreasing during this period of time. 5. Whereas the population of our planet reached the first billion mark near the year 1830, today's population is approximately 3 billion, with an additional billions being added in increasingly shorter periods of time. 6. Both the Red Sea and the Gulf of California are the recent result of rifting and sea-floor spreading. 7. Convergence of two ocean plates leads to the construction of island arcs such as the Aleutians, the Tonga Islands, and Japan. 8. The focii of subduction zone earthquakes range in depth from shallow at the trench to several hundred kilometers beneath the overriding plate. 9. Transform faults connect ends of offset ocean ridges. 10. Pangea formed from a number of continental collisions leading to the formation of the Sierra Nevada and San Gabriel Mountains. 11. Without radioactivity, the Earth would be a dead planet. 12. The present site of the Ural Mountains represents the demise of a long-lost ocean basin. 13. Sedimentary rocks at the top of a geocline are as old as the initial rifting that formed the ocean basin. 14. During the early 1900’s, Alfred Wegener presented ideas about sea-floor spreading. 15. Wegner’s proposed supercontinent, from Greek meaning “all earth” was ___________. 16. California is destined to sink into the ocean. 17. The fluid motion of the asthenosphere is the cause of the Earth's magnetic field. 18. Basalt magma is a more fluid liquid than that of andesite because it contains more silica and is at a lower temperature. 19. The most common rock type erupted above subduction zones is basalt. 20. Pahoehoe is a Hawaiian term applied to pyroclastic basalt eruptions. 21. The port town of St. Pierre, on the Caribbean Island of Martinique, was destroyed by a nuee ardente (pyroclastic flow). 22. Volcanoes are the earth’s most dangerous natural hazard followed by hurricanes and earthquakes. 23. Destruction of Krakatoa generated huge tsunami waves. 24.
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Crises Exam 1 '08 - Midterm1 September23,2008...

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