glg101r2_appendix_h_lab_report

Batholith and stock 49 granite comprising stone

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Batholith and Stock 4.9. Granite comprising Stone Mountain crystallized from magma tens of kilometers within the Earth, but uplift and erosion has since laid this pluton bare. Assuming that erosion has only slightly modified the original shape of the more durable granite body, which of the igneous rock bodies in Figure 4.5 does Stone Mountain most closely resemble? Lava rocks and debris 4.10. The lip of the crater has been breached by a lava flow, and a deep furrow marks its path. In what map direction did that lava move, southeastward or northwestward? (Notice the arrow along the left margin of the page indicating north.) Answer: southeastward 4.11. Judging from the sizes of the before-and-after craters atop Mount St. Helens (Figs. 4.8 and 4.9 of the Lab book), which volcanic event appears to have been the more explosive, the last one before 1980, or that which occurred in 1980? The 1980 eruption
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4.14. Applying the rule— the most complete form crystallizes first, and the least complete form crystallizes last —list the four minerals in Figure 4.11 of the Lab book (W, X, Y, and Z) in the order in which they crystallized. ( Caution : The stack of cards in Figure 4.10 is 3- dimensional, with one
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