Unit 4 Lab Igneous Rocks Spr 24 Rev 3 STUDENT RESPONSES
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Geology
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Feb 20, 2024
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1 STUDENT RESPONSES 1. Sample B has what mafic color index (MCI)? a. 0-15% MCI b. 16-45% MCI c. 46-85% MCI d. >85% MCI 2. Sample B belongs to which igneous rock classification? a. ultramafic b. mafic c. intermediate d. felsic 3. According to Figure 1, when Sample B is heated, what is the first mineral to melt? a. potassium feldspar b. quartz c. Ca-rich plagioclase d. olivine 4. Sample C has what mafic color index (MCI)? a. 0-15% MCI b. 16-45% MCI c. 46-85% MCI d. >85% MCI 5. The pink minerals in Sample C are most likely a. muscovite b. potassium feldspar c. quartz d. olivine 6. Sample D belongs to which igneous rock classification? a. ultramafic b. mafic c. intermediate d. felsic 7. Sample F belongs to which igneous rock classification? a. ultramafic b. mafic c. intermediate d. felsic 8. According to Figure 1, Sample F will never contain which mineral? a. pyroxene b. olivine c. quartz d. plagioclase feldspar 9. Sample S has what mafic color index (MCI)? a. 0-15% MCI b. 16-45% MCI c. 46-85% MCI d. >85% MCI 10. How did Sample A form? a. by magma that cooled slowly b. by fast cooling lava c. by a very fast cooling lava d. by magma that was cooling slowly, then as a lava that cooled quickly 11. How did Sample B form? a. by magma that cooled slowly b. by fast cooling lava c. by a very fast cooling lava d. by magma that was cooling slowly, then as a lava that cooled quickly 12. Sample C has what texture? a. phaneritic b. aphanitic c. porphyritic-aphanitic d. glassy
2 13. How did Sample E form? a. by magma that cooled slowly b. by fast cooling lava c. by a very fast cooling lava d. by magma that was cooling slowly, then as a lava that cooled quickly 14. Sample F has what texture? a. phaneritic b. aphanitic c. porphyritic-aphanitic d. glassy 15. Sample S has what texture? a. phaneritic b. aphanitic c. porphyritic-aphanitic d. glassy 16. How did Sample S form? a.
By magma that cooled slowly b.
By fast cooling lava c.
By a very fast cooling of lava d.
By magma that was cooling slowly, then as a lava that cooled quickly 17. Use Figure 9 and the work you have done so far to fill out Table 1. Sample Letter Mineral Composition Minerals Present Texture Intrusive or Extrusive? Rock Name Table 1. The Igneous Rock ID table. 18. In the search bar in Google Earth, enter the following locations for the Novarupta crater: 58 13 43.90N 155 7 24.21W. You may want to placemark this spot. Now find Mt. Katmai at: 58 16 42.40N 154 56 58.85W. When Novarupta erupted in 1912, nearby Mount Katmai collapsed as magma was drained from underneath it and vented at Novarupta. What is the distance, in miles, between these 2 locations? a. 2 miles b. 4.8 miles c. 7.25 miles d. 12 miles
3 19. What feature is now present at the summit of Mt. Katmai? a. lava dome b. lake c. butte d. shield volcano
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