Johson - GEO 303, Quiz 1 W Name (printed) _ October 3, 2006...

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Sheet1 Page 1 GEO 303, Quiz 1 W Name (printed) _________________________________________ 10/03/06 100 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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Sheet1 Page 2 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. 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 ity was weathered at location D developed within the sequence of marine limestone strata. 5. Which one of the following changes might occur if quartz and kaolinite (a clay mineral) are meta- 4. Refer to the cross section above. Weathering attacks rock at the earthhs surface, transforming it into
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Sheet1 Page 3 morphosed? (A) conversion of anhydrous minerals to hydrous minerals form andalusite, sillimanite, or kyanite ture back to quartz and kaolinite. 6. Which of the following mineral pairs would be considered polymorphs? (A) biotite and muscovite (B) quartz and feldspar ( 7. Which one of the following statements about either prokaryotes or eukaryotes is correct? (A) Pro- karyotes (for example, cyanobacteria) lack DNA. (B) Prokaryotes are multi-celled organisms, each cell containing a nucleus. (C) Eukaryotes have simple cells with no cell nucleus. (D) Animals, of the king-
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Johson - GEO 303, Quiz 1 W Name (printed) _ October 3, 2006...

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