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Johson QUIZ 1 - GEO 303 Quiz 1 W Name(printed October 3...

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GEO 303, Quiz 1 W Name (printed) _________________________________________ October 3, 2006 100 points Page 1 of 5 INSTRUCTION: (i) Put a "W" (for white exam) in the upper-right corner of your answer sheet. (ii) Answer the questions by blackening the "bubbles" on the provided special answer sheet. Each of 40 questions has only one correct answer that is worth 2.5 points. In some cases, choose the best (most in- clusively accurate) of the answers. (iii) Turn in this exam copy and your answer sheet together, with your name on both. 1. Which one of the following choices correctly associates a silicate mineral with its chemical composi- tion (ferromagnesian or non-ferromagnesian), and the arrangement of silicon-oxygen tetrahedrons in its crystal structure? Mineral Composition Arrangement of Si-O Tetrahedrons (A) K-feldspar, ferromagnesian, framework (B) pyroxene, non-ferromagnesian, double chain (C) olivine,
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ferromagnesian, isolated tetrahedrons (D) quartz, non-ferromagnesian, sheet 2. Which one of the following choices correctly describes a type of sediment? (A) Mature sediment has been transported longer/farther than immature sediment. (B) Clastic sediment is precipitated from ions in solution. (C) River gravel and sand are examples of chemical sediment. (D) Clastic sediments are deposited as strata, but chemical sediments are not. 3. The cross section shows geologic relationships visible in Grand Canyon National Park, Arizona. Which statement is correct? (A) This region is not now, and never has been below sea level. (B) Deep erosion took place during a prolonged inter- val that preceded 0.54 billion (or 540 million) years ago. (C) Effects of contact metamorphism are visible in the Cambrian sandstone (which originated under cool conditions) where it is in contact with the underlying metamorphic rock (which originated under hot conditions). (D) Dat- ing of sand grains in the Cambrian sandstone pro- vides its age of sedimentary deposition. 4. Refer to the cross section above. Weathering attacks rock at the earth s surface, transforming it into soil. Where would you expect to find a paleosol (soil millions of years old)? (A) at location A at the bottom of the Colorado River channel; (B) at location B where basement rock just below the unconform- ity was weathered; (C) at location C developed in Cambrian sandstone just above the unconformity; (D) at location D developed within the sequence of marine limestone strata.
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5. Which one of the following changes might occur if quartz and kaolinite (a clay mineral) are meta- morphosed? (A) conversion of anhydrous minerals to hydrous minerals; (B) rearrangement of atoms to form andalusite, sillimanite, or kyanite; (C) loss of silicon (Si) and aluminum (Al) from the crystal struc- ture; (D) rearrangement of atoms to form andalusite, sillimanite, or kyanite followed by a transformation back to quartz and kaolinite.
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