• Document: Rocks and Minerals Multiple Choice
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Rocks and Minerals Multiple Choice 1. The basaltic bedrock of the oceanic crust is 2. Which property is most useful in distinguishing ? ? classified as pyroxene from amphibole? (1) felsic, with a density of 2.7 g/cm3 (1) sample size (3) type of luster (2) felsic, with a density of 3.0 g/cm3 (2) hardness (4) angles of cleavage (3) mafic, with a density of 2.7 g/cm3 (4) mafic, with a density of 3.0 g/cm3 The diagram below represents geological processes that act continuously on Earth to form different rock types. 3. Which table correctly classifies each rock type? ? Interactive Format Completed by Paul Wiech The table below shows some properties of four different minerals. 4. The minerals listed in the table are varieties of which mineral? ? (1) garnet (3) quartz (2) magnetite (4) olivine 5. An igneous rock contains 10 grams of radioactive 6. Dolostone is classified as which type of rock? ? ? potassium-40 and a total of 10 grams of its decay products. During which geologic time interval was (1) land-derived sedimentary rock this rock most likely formed? (2) chemically formed sedimentary rock (3) foliated metamorphic rock (1) Middle Archean (4) nonfoliated metamorphic rock (2) Late Archean (3) Middle Proterozoic (4) Late Proterozoic Interactive Format Completed by Paul Wiech Base your answers to questions 7 through 9 on the cross section below. Rock units are labeled 1 through 8. The line between A and A indicates an unconformity. 7. Which characteristic of the granite intrusion provides the most evidence that it solidified deep ? underground? (1) very hard (3) light color (2) coarse texture (4) felsic composition 8. Which event occurred sometime after the formation of the unconformity? ? (1) formation of rock unit 3 (2) tilting of rock unit 5 (3) deposition of the sediments that formed rock unit 8 (4) intrusion of rock unit 7 9. Which rock most probably formed in the contact metamorphic zone within rock unit 6? ? (1) marble (3) quartzite (2) basalt (4) hornfels Interactive Format Completed by Paul Wiech 10. Which processes formed the granite that is 11. Some of the bedrock in the Green Mountains is ? ? mined in Vermont? actually green in color because of the presence of the mineral chlorite. Which other mineral can (1) compaction and cementation of sediments cause rocks to appear green? (2) cooling and solidification of magma (3) uplift and weathering of bedrock (1) sulfur (3) olivine (4) application of heat and pressure to shale (2) magnetite (4) halite The diagram below shows the index minerals of 12. Which mineral has a metallic luster, a black ? Mohs hardness scale compared with the hardness of streak, and is an ore of iron? some common objects. (1) galena (3) pyroxene (2) magnetite (4) graphite 13. Which statement is best supported by the ? diagram? (1) A fingernail will scratch calcite but not gypsum. (2) Calcite will be scratched by a copper penny. (3) The mineral apatite will scratch topaz. (4) A steel file has a hardness of about 7.5. Interactive Format Completed by Paul Wiech The data table below shows the density of four The photograph below shows an igneous rock. different mineral samples. 14. A student accurately measured the mass of a ? sample of one of the four minerals to be 294.4 grams 17. What is the origin and rate of formation of this and its volume to be 73.6 cm3. Which mineral rock? ? sample did the student measure? (1) corundum (3) hematite (1) plutonic with slow cooling (2) g

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