Geol125 Exam 2 - Exam II GEOL 125 Earth History Sample...

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Exam II: GEOL 125 Earth History Sample Questions I. Multiple Choice Quickies: Choose the letter corresponding to the best choice. Read the wording carefully because some are tricky (note *). Fill in your answer on the Scantron sheet. Do not forget to put your name on the scantron sheet. (15 pts) 1. What sort of environment is a likely setting for life to originate? a) a planet like the present earth, b) a planet like the present Mars, c) a hydrothermal system, d) a shallow pond. 2. The ratio of Si:O in quartz is _________, and the ratio in basalt is ______. a) always the same, always the same; b) always the same, variable; c) variable, always the same; d) variable, variable. 3.* Metamorphism: a) results from melting rocks at high T and P, b) can reset the radioactive clocks in minerals; c) occurs in sedimentary basins, d) requires subduction into the core. 4.* A genetic code might possibly be carried by: a) cell membranes; b) RNA, c) amino acids, d) proteins, e) enzymes. 5. Plate rotations are best determined from: a) magnetic reversals, b) rock types, c) marine transgressions, d) magnetic inclination; e) magnetic declination.
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