penaloza - geology Unit 5 Lab

STUDENT RESPONSES 1. The formation of Sample G includes: a. Chemical weathering, transport of ions, precipitation of minerals, lithification b. Mechanical weathering, transport of sediment, deposition of sediment, lithification c. Chemical weathering, transport of ions, precipitation of minerals as shells by organisms, deposition, lithification. d. Crystal precipitation during the evaporation of water, such as in a drying lake bed. 2. Sample G is composed of ___________. a. clastic sediments the size of pebbles b. clastic sediments the size of sand c. calcite crystals d. calcite shells e. gypsum crystal 3. Sample H has the following characteristics: a. effervesces in dilute acid b. contains fossil shells and effervesces in dilute acid c. contains sand-sized grains and scratches glass d. does not contain grains and scratches glass e. does not contain grains and can be scratched with a fingernail f. consists of grains too small to see, giving it a smooth appearance 4. The formation of Sample H includes: a. Chemical weathering, transport of ions, precipitation of minerals, lithification b. Mechanical weathering, transport of sediment, deposition of sediment, lithification c. Chemical weathering, transport of ions, precipitation of minerals as shells by organisms, deposition, lithification. d. Crystal precipitation during the evaporation of water, such as in a drying lake bed. 5. Sample I has the following characteristic: a. effervesces in dilute acid b. contains fossil shells and effervesces in dilute acid c. contains sand-sized grains and scratches glass d. does not contain grains and scratches glass e. does not contain grains and can be scratched with a fingernail f. consists of grains too small to see, giving it a smooth appearance 6. The formation of Sample I includes: e. Chemical weathering, transport of ions, precipitation of minerals, lithification f. Mechanical weathering, transport of sediment, deposition of sediment, lithification g. Chemical weathering, transport of ions, precipitation of minerals as shells by organisms, deposition, lithification. h. Crystal precipitation during the evaporation of water, such as in a drying lake bed. 7. The formation of Sample J includes: a. Chemical weathering, transport of ions, precipitation of minerals, lithification b. Mechanical weathering, transport of sediment, deposition of sediment, lithification c. Chemical weathering, transport of ions, precipitation of minerals as shells by organisms, deposition, lithification. 1

d. Crystal precipitation during the evaporation of water, such as in a drying lake bed. 8. Sample J is composed of ___________. a. clastic sediments the size of pebbles b. clastic sediments too small to pick out c. microcrystalline quartz d. calcite shells e. gypsum crystals 9. Sample K has the following characteristic: a. effervesces in dilute acid b. contains fossil shells and effervesces in dilute acid c. contains pebble-sized grains and scratches glass d. does not contain grains and scratches glass e. does not contain grains and can be scratched with a fingernail f. consists of grains too small to see, giving it a smooth appearance 10. The formation of Sample K includes: a. Chemical weathering, transport of ions, precipitation of minerals, lithification b. Mechanical weathering, transport of sediment, deposition of sediment, lithification c. Chemical weathering, transport of ions, precipitation of minerals as shells by organisms, deposition, lithification. d. Crystal precipitation during the evaporation of water, such as in a drying lake bed. 11. The formation of Sample L includes: a. Chemical weathering, transport of ions, precipitation of minerals, lithification b. Mechanical weathering, transport of sediment, deposition of sediment, lithification c. Chemical weathering, transport of ions, precipitation of minerals as shells by organisms, deposition, lithification. d. Crystal precipitation during the evaporation of water, such as in a drying lake bed. 12. Sample L is composed of ___________. a. clastic sediments the size of pebbles b. clastic sediments too small to pick out c. microcrystalline quartz d. calcite shells e. gypsum crystals 13. Fill out Table 3, the Sedimentary Rock ID Chart. PLEASE FILL OUT A ROW FULLY FOR EACH SAMPLE AND IDENTIFY WHAT KIND OF ROCK THE SAMPLE IS. In identifying each rock, think about some of the properties we learned about for minerals. Gypsum is soft, chert is hard. Carbonates fizz in acid, silicates don't. Use this to tell some of these samples apart and identify them! Sample Letter Type (Clastic,Chem , Biochem) Mineral Composition Texture (grain size, etc.) Other Properties Rock Name G chemical Microcrystallin e polymorphs of quartz Course grained Scratches glass Chert 2

b. mud cracks c. cross beds d. trace fossils e. graded beds f. raindrop impressions 18. Search for 18 13 45.22S 146 45 34.85E and zoom out to an eye altitude of ~50 miles. What type of sedimentary environment is this? a. Lacustrine b. Fluvial c. Eolian d. Glacial e. Reef 19. Search for 24 37 42.52N 82 52 23.47W and familiarize yourself with Dry Tortugas. This park is known for its beautiful coral reefs, and has about 30 species of coral. What mineral do corals use to make up their skeletons? a. gypsum b. halite c. quartz d. calcite 20. Fort Jefferson is built atop a small, sandy island called Garden Key. How did Garden Key form? a. on top of a coral reef b. as debris collected from hurricanes c. as a large sand bar d. as a portion of the state of Florida that broke off 4