Phy-113-601-Lab5_ANS.pdf - hand-held magnifying lens(one...

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_____ hand-held magnifying lens (one per group of students) _____ charts for visual estimation of percent (cut from GeoTools 1 or 2 ACTIVITY 5.9: Geologic History of Southeastern Pennsylvania _____ none INSTRUCTOR NOTES AND REFERENCES 1. Rock samples in the set of rock samples (same set for Activities 5.4, 5.5, and 5.8) must be marked with an identifying number. 2. Lava lamp option. Student understanding of magmatic processes and igneous intrusions is aided by making simple analogies to the "lava" in a lighted convecting lava lamp. This is especially useful for showing how masses of "lava" in the lamp accumulate at the top of the lamp in a manner analogous to how batholiths may form. 3. Igneous rock-forming minerals. It is useful to have students construct a flowchart for identification of these minerals. You may also want to display examples of these minerals for student observation/analysis. LAB 5 ANSWER KEY ACTIVITY 5.1: Mineral and Rock Inquiry 5.1A. 1. black and gray rock; made of hornblende and plagioclase; coarse-grained visible crystals randomly arranged and intergrown 2. transparent dark brown to black rock; made of glass; glassy texture breaks with a conchoidal fracture 3. dark gray rock; made of tiny crystals and vesicles (bubbles) 4. pink/orange, black, white, and gray rock; made of K-spar, plagioclase, quartz, and biotite; visible crystals are randomly arranged and inter-grown 5. black, white , and pink/orange rock; made of hornblende, K-spar, and quartz; very large visible crystals intergrown randomly 6. dark gray to red-gray rock; made of fine-grained material and abundant 72
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vesicles (bubbles); randomly arranged vesicles (bubbles) 5.1B. Reflect and Discuss: Answers will vary greatly.
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