Geology 101, Fall 2006 Sample quiz 1 (Maps, minerals, ig, sed and met rocks) Open notes, closed textbook, open labs and handouts, no collaboration. You have 50 minutes to complete the 50-point quiz. Short answer — (2 points for each, except as stated); answer all questions. 1. With whom are you doing your poster project (solo is fine)? What topic are you covering (be as specific as you can)? 2. Choose the best map that will fit the given need (there is only one correct solution for each need): a. To plan lahar evacuation routes b. To determine what other volcanoes might pose a lahar hazard. Your map choices: a topographic map, a geologic map, a plate tectonic map 3. (3 points) The second law of thermodynamics explains that hot bodies will transfer heat to cold bodies. This transfer is called _____________________ in the asthenosphere. However, the lithosphere does not allow the same type of heat transfer; the way in which the Earth informs us surface people that the second law is still working is through geological phenomena such as ________________________________ and _____________________________ . 4. The mineral in front of you has (circle one of the following): fracture or cleavage or both fracture and cleavage It also has a _____________ luster; between these two characteristics, the mineral should be pretty easy to identify. 5. Connect the word or phrase on the left that best matches one word or phrase on the right. a. Granite based on density b. Quartz is a mineral c. Lithosphere is a rock d. Crust based on solidity For question 6 (3 points), choose one of the words contained in each set of parentheses (see example):Example: If I don’t pay attention to the amount of time left on the exam, I will fail to do the (short answer/essay) section and therefore perform quite (well/poorly). 6. Mature sediment tends to be made of (mafic/intermediate/felsic) minerals. In addition, the grains of such a sediment tend to be (angular/rounded) and (well-, moderately-, poorly-) sorted. Essay questions — (12 points each); answer two of the following and please circle the number of the questions chosen. Make sure your answer is in paragraph form. 13. Galena is a mineral with the chemical formula PbS. a. Explain what force is holding the lead and the sulfur together and how the lead and sulfur atoms must prepare in order for this force to work. b. As you know, galena has a cubic cleavage. How does the force in part a help explain the cleavage of galena? 14. Look at the photograph below. a. The snow- and ice-covered mountain in the background is a volcano. What type of volcano is it? Justify your choice. b. The forested ridges in the foreground and middle distance are an ancient maar. Did the two volcanoes (the one in the background and the maar) had the same magmatic source? Explain your choice. c. Most volcanoes are found at plate boundaries. At which type of plate boundary (divergent, convergent or transform) are these volcanoes found? Again explain why these type of volcanoes are found at that particular
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