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Sedimentary Rocks PQs Name: 1. Date: Base your answer(s) to the following question(s) on the drawings of six sedimentary rocks labeled A through F. A Conglomerate B Breccia C Sandstone D Shale E Limestone F Rock salt 1. Which two rocks are composed primarily of quartz, feldspar, and clay minerals? 2. A. rock salt and conglomerate B. C. sandstone and shale D. sandstone and limestone Which table shows the rocks correctly classi ed by texture? A. B. C. D. 3. rock salt and breccia Texture Rock Texture Rock clastic bioclastic cystalline A, B, C, D E F clastic bioclastic cystalline A, B, C D E, F Texture clastic Rock Texture Rock bioclastic cystalline A, C B, E D, F clastic bioclastic cystalline A, B, F E C, D 2. Which rock type is most likely to be monomineralic? A. rock salt B. rhyolite C. basalt page 1 3. D. conglomerate Sedimentary Rocks PQs 4. Which sedimentary rock may have both a chemical origin and an organic origin? A. 5. B. rock gypsum C. rock salt D. shale Which rock is made up of angular fragments of rock held together by a natural cement? A. 6. limestone breccia B. scoria C. granite The rock is older than the pebbles. B. The rock is igneous. C. The rock is sedimentary. 5. D. quartzite A rock is composed of several large, rounded pebbles and sand grains cemented together. Which inference about the rock is best supported by this description? A. 4. 6. D. The rock resulted from evaporation of seawater. 7. Rocks can be classi ed as sedimentary, igneous, or metamorphic based primarily upon di erences in their A. 8. 9. color B. density C. origin 7. D. age Which phrase best describes coal? 8. A. low density, ma c B. chemical precipitate C. organic plant remains D. glassy texture, volcanic Most rock gypsum is formed by the 9. A. heating of previously existing foliated bedrock B. cooling and solidi cation of lava C. compaction and cementation of shells and skeletal remains D. chemical precipitation of minerals from seawater page 2 Sedimentary Rocks PQs 10. Which diagram best shows the grain size of some common sedimentary rocks? 10. A. B. C. D. 11. 12. Most rocks that form from fragmental rock particles are classi ed as A. extrusive igneous B. C. clastic sedimentary D. chemical sedimentary intrusive igneous Which mineral precipitates from oceans and forms rock salt? A. quartz B. uorite C. 11. halite page 3 12. D. olivine Sedimentary Rocks PQs 13. 14. 15. A student obtains a cup of quartz sand from a beach. A saltwater solution is poured into the sand and allowed to evaporate. The mineral residue from the saltwater solution cements the sand grains together, forming a material that is most similar in origin to A. an extrusive igneous rock B. C. a clastic sedimentary rock D. a foliated metamorphic rock 13. an intrusive igneous rock Which two processes lead directly to the formation of both breccia and conglomerate? A. melting and solidi cation B. C. compaction and cementation D. evaporation and precipitation 14. heat and pressure Base your answer(s) to the following question(s) on the diagram below, which represents a cross section of rock layers that have not been overturned. The breccia layer is composed mostly of A. cemented, rounded rock fragments B. cemented, angular rock fragments C. intergrown, ne-textured crystals D. microscopic shells page 4 15.
