Prelim_1_Fall_2007_Version_A_Short_mm_mk_changes_answ -...

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EAS/BIOEE 154 Prelim 1 VERSION: A Fall 2007 1. Which version of the prelim are you taking (see above)? a. Version A b. Version B 2. Which of the following is most true? a. The earth formed 15 billion years ago when ionic plasma from the Big Bang collided and coalesced into a molten earth that cooled before being captured gravitationally by the present-day sun about 4.6 billion years ago. b. The earth formed about 4.6 billion years ago through the aggregation of solid grains of rock-forming elements that were in orbit around the early solar disc (future sun). c. The earth formed about 4.6 billion years ago when a planet the size of Jupiter slammed into the sun and ejected a great amount the mass the then cooled to form earth. 3. Out-gassing from volcanoes during early earth history released: a. Water Vapor and Carbon Dioxide b. Water Vapor, Carbon Dioxide and Oxygen 4. The average depth of the ocean is a. 400 meters b. 4 kilometers c. 40 kilometers d. 400 kilometers 5. If the earth was scaled down to the size of a beach ball (0.5 meter diameter), the ocean depth would be about a. 1.5 millimeters b. 1.5 centimeters c. 150 centimeters 6. If you were on a boat that was positioned at 30N and 140W, which ocean would you be in? a. Atlantic b. Pacific c. Indian d. Arctic
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7. Evidence that seafloor spreading was occurring along mid-ocean ridges was provided by a. Symmetric banding of magnetic anomalies on either side of the mid- ocean ridge b. Compressional faulting along the ridge axis c. Symmetric banding of gravity anomalies on either side of the mid-ocean ridge 8. Plate tectonic theory states that a. The outer portion of the earth is composed of a single ridge crust, called a tectonic plate, through which continents are able to drift and collide with one another. b. The outer portion of the earth is composed of continental crust and oceanic crust both of which are continually being subducted back into the molten interior of the earth and then reformed anew at other locations c. The outer portion of the earth is composed of many plates, which are composed of both of oceanic and continental crust, but only the oceanic crust is constantly being destroyed by subduction while continental crust avoids subduction . 9. The driving mechanism for plate tectonic motion is: a. The moon’s gravity and the centrifugal force b. Planetary rotation c. Mantle convection d. Earth’s magnetic field acting on iron minerals in ocean crust 10. What will eventually happen to the East Africa Rift Zone and the Red Sea? a. The Red Sea will be closed off as opposing tectonic plates collide b. A large ocean basin will form as opposing tectonic plates diverge and the Red Sea opens wider. c.
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Prelim_1_Fall_2007_Version_A_Short_mm_mk_changes_answ -...

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