Exam1_S07a KEY

Exam1_S07a KEY - Geology 101 Section 001 Fall 2007 Name...

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1 Geology 101 Name (print) KEY v. A Section 001 Fall 2007 TEST #1 (each question worth 1 pt; 70 pts total) Version: A I. Multiple Choice. Read each question carefully and pick the BEST answer. Clearly mark your SCANTRON to indicate your choice. 1. Extrusive igneous rocks ______. 1) cool relatively fast 2) can contain pyroclastic material 3) includes rhyolites 4) all of the above 5) none of the above 2. Which of the following best explains why graphite is soft compared to diamond? 1) weak van der Waals forces link sheets of graphite 2) graphite is made of lead (Pb) and diamond is made of carbon (C) 3) graphite contains no covalent bonds 4) all of the above 5) none of the above 3. A ______ is an igneous body that intrudes concordantly (parallel) with overlying rock layers. 1) sill 2) dike 3) stock 4) tuff 4. The average density for continental plates is 2.7 g/cm 3 . Given what you know about the role of density at subduction zones, what is the average density of the oceanic crust? 1) 2.7 g/cm 3 2) 2.5 g/cm 3 3) 3.0 g/cm 3 4) 2.3 g/cm 3 5. Magma viscosity decreases with increasing ______. 1) temperature 2) silica content 3) number of olivine crystals 4) all of the above
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6. Melting temperatures typically ______ when water is added 1) increase 2) decrease 3) remain unchanged 7. Which is NOT evidence of internal order within minerals? 1) constancy of interfacial angles 2) definable composition 3) well-formed crystal faces 4) perfect cleavage plane in one or more direction 8. Which of the following lists the minerals with covalent, ionic, and metallic bonding respectively? 1) halite, gold, mica 2) gold, halite, mica 3) quartz, halite, copper 4) fluorite, platinum, quartz 5) none of the above 9. Primary names are assigned to igneous rocks based on ______. 1) the geographic location of discovery 2) texture and composition 3) the person who identified the rock 4) weathering reaction products 5) all of the above 10. The rock cycle is driven by ______. 1) climate processes 2) tectonic processes 3) the earth’s internal heat 4) all of the above 5) none of the above 11. Atomic weight is defined by 1) Number of protons plus neutrons 2) Average mass of known isotopes 3) The number of electrons in a neutral atom 4) 1 and 2 only 5) 2 and 3 only 12. Glass is not a mineral because ______. 1)
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Exam1_S07a KEY - Geology 101 Section 001 Fall 2007 Name...

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