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Name_____________________________
Exam 1
Feb. 24, 2017
Geology 1100
Blue Question Sheet
Closed book. No calculator, phone, or other electronic device use is allowed. Place all books,
notebooks, and backpacks under your seat. No water or soda bottles are allowed either. If you
have a hat with a brim, turn it backwards so we can see you clearly.
The exam will end promptly at 11:50 AM. When you are done bring your answer sheet and
question sheet up to the front and place them in the appropriate box. Please have your UW ID
card out.
A) Write you name in the space provided above on this question sheet and turn it in with your
bubble sheet. However answer all the questions on the bubble sheet, not here.
B) On the bubble sheet enter your LAST (family)
NAME, a space, then your FIRST NAME, then
a space, and finally a MIDDLE INITIAL, as it
appears on your UW registration. Also fill in
the circles below the name, including the ones
for the spaces (as shown by the arrows at right.)
C) Enter your UW number in the IDENTIFICATION
NUMBER block, using the 8 spaces A--H. Do use all
8 digits including the leading zero, but drop the W.
D) Enter your lab section number (listed below) in the
IDENTIFICATION NUMBER block, using
the right hand two spaces marked I and J.
E) In Special Code K fill in the following information:
0 if you have a white question sheet.
1 if you have a blue question sheet.
F) You do NOT need to enter other information like Birth Date.
Lab Section Numbers
11 Tue. 10:00 am-11:50 am
12 Tue. 03:10 pm-05:00 pm
13 Tue. 07:00 pm-08:50 pm
14 Wed. 08:00 am-09:50 am
16
17
18
Wed. 01:10 pm-03:00 pm
Wed. 03:10 pm-05:00 pm
Tue. 01:10 pm-03:00 pm
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1. A thoroughly tested scientifically explanation for a phenomenon is called a:
a. fact
d. hypothesis
b. guess
e. theory
c. observation
2. Suppose you observe that most valleys currently being carved by glaciers are broad and U-shaped
(rather than V shaped.) You then find that some valleys in the Tetons are broad and U shaped.
What principle used in geology should make you suspect that those Teton valleys were carved by a
glacier?
a. The principle of least action
d. The principle of conservation of energy
b. The principle of superposition
e. The principle of uniformitarianism
c. The principle of lateral continuity
3. Which of the following usually dominates in warm humid environments?
a. physical weathering
b. chemical weathering
4. All carbon has 6 protons. How many neutrons does Carbon-14 (14C) have?
a. 5
d. 8
b. 6
e. 9
c. 7
5. New oceanic crust is created at:
a. Transform plate boundaries
b. Convergent plate boundaries
c. Divergent plate boundaries
6. Old oceanic crust is destroyed at:
a. Transform plate boundaries
b. Convergent plate boundaries
c. Divergent plate boundaries
7. Two tectonic plates slide past each other at:
a. Transform plate boundaries
b. Convergent plate boundaries
c. Divergent plate boundaries
8. In what kind of bond does one atom donate an electron and another atom accept it?
a. covalent bond
d. metallic bond
b. Van der Waals bond
e. ionic bond
c. hydrogen bond
9. In what kind of bond are electrons shared between two atoms?
a. covalent bond
d. metallic bond
b. Van der Waals bond
e. ionic bond
c. hydrogen bond
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10. What type of bond is formed between carbon in diamond?
a. covalent bond
d. metallic bond
b. Van der Waals bond
e. ionic bond
c. hydrogen bond
11. What type of bond is formed between Na and Cl in halite?
a. covalent bond
d. metallic bond
b. Van der Waals bond
e. ionic bond
c. hydrogen bond
12. What mineral has the formula (Mg,Fe)2SiO4 where each silica tetrahedra is isolated, not linked?
a. plagioclase
d. olivine
b. calcite
e. hematite
c. quartz
13. What mineral has the formula SiO2 and each oxygen is shared between silica tetrahedra?
a. plagioclase
d. olivine
b. calcite
e. hematite
c. quartz
14. What mineral has the formula CaCO3 ?
a. plagioclase
d. olivine
b. calcite
e. hematite
c. quartz
15. Which of the minerals below will fizz in dilute hydrochloric acid?
a. hematite
d. pyroxene
b. pyrite
e. quartz
c. calcite
16. Which of the following three properties of ions is LEAST important in determining which ions can
substitute for other ions in a mineral?
a. charge
b. mass
c. size
17. When a large part of a volcano collapses into its magma chamber it forms a:
a. Caldera
b. Cinder Cone
c. Lava Dome
18. Which of the following is an intrusive igneous body that is very large, both horizontally and
vertically?
a. chilled margin
d. volcanic neck
b. dike
e. batholith
c. sill
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The next three questions relate to the following table of igneous rocks. For each question fill in the
name of the rock that fits in that box.
Grain Size \
Mafic
Intermediate
Feslic
Composition
Fine Grained
Rock I
Rock III
Coarse Grained
Rock II
Rock IV
19. Rock I is a
a. gabbro
b. granite
c. rhyolite
d. basalt
20. Rock II is a
a. gabbro
b. granite
c. rhyolite
d. basalt
21. Rock III is a
a. gabbro
b. granite
c. rhyolite
d. basalt
22. Rock IV is a
a. gabbro
b. granite
c. rhyolite
d. basalt
The above figure compares a profile across the shield volcanoes Mauna Loa and Kilauea (measured
from the floor of the Pacific Ocean) with a profile across the composite volcano Mount Rainier.
23. The difference in profile is largely due to the difference in viscosities of the typical lavas erupted at
these volcanoes. Based on that viscosity difference, which of the following is true?
a. Mauna Loa lava is more mafic than Mount Rainier lava.
b. Mauna Loa lava is more felsic than Mount Rainier lava.
24. Another property related to the above differences is gas content. Which of the following is true?
a. Mauna Loa lavas are more gas rich than Mount Rainier lavas.
b. Mauna Loa lavas are less gas rich than Mount Rainier lavas.
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25. Which rocks and minerals typically have the lower temperature melting point?
a. Mafic (such as olivine)
b. Felsic (such as quartz and potassium feldspar)
26. A shale belongs to which broad class of sedimentary rocks?
a. Chemical
b. Clastic
27. A common mineral produced when feldspar in granite weathers is:
a. quartz
d. clay
b. olivine
c. pyroxene
28. Which of the following minerals is least susceptible to weathering?
a. feldspar
b. mica
c. quartz
Consider sediments being deposited off a shore as shown in the following figure. For each of the
following types of sediments, will they typically be deposited at location A or B or C?
29. Sandy Sediments: Deposited at A or B or C?
30. Limey Sediments: Deposited at A or B or C?
31. Muddy Sediments: Deposited at A or B or C?
32. The Maroon Formation in Colorado (which is the rock in the Maroon Bells near Aspen) is arkosic,
which means it contains significant feldspar. What is the more likely conclusion based on its arkosic
nature?
a. The sediments which formed it came from relatively nearby rocks.
b. The sediments which formed it were transported over long distances.
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33. Which of the following rivers would produce sediments which are more sorted, so that in a given
location the deposited sediment grains are all of similar size?
a. A western stream subject to frequent flash floods
b. An eastern river with steady regular flow
34. Which of the following minerals would be missing in a higher grade metamorphic rock, because it
would have been converted to some other mineral more stable at higher temperature?
a. quartz
d. clay
b. feldspar
e. biotite
c. amphibole
35. The three broad families of rock are sedimentary, metamorphic, and ____.
a. non-silicate
d. igneous
b. mafic
e. felsic
c. silicate
36. Which forms a better index mineral, for determining metamorphic conditions:
a. a mineral like quartz which is stable over a broad temperature range?
b. a mineral like chlorite, which is stable only over a narrow temperature range?
37. Which of the following would be unlikely to result in metamorphism of the rocks involved?
a. intrusions of a nearby batholith
d. collision of two continents
b. burial of sediments
e. erosion and exposure of rocks
c. subduction at an ocean trench
38. Which of the following is a non-foliated or weakly foliated metamorphic rock?
a. quartzite
d. basalt
b. rhyolite
e. sandstone
c. slate
39. If shale is heated and compressed, the highest grade metamorphic rock formed, consisting of
alternating band of felsic and mafic material, is called a:
a. slate
d. schist
b. phyllite
e. marble
c. gneiss
40. Suppose at a contact between a sedimentary rock and a granite you find weathered pieces of the
granite included in the sedimentary rock. Which of the following is true?
a. The granite is younger than the sedimentary rock.
b. The granite is older than the sedimentary rock.
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Unconformities: All the regions (including the gray at the top) are layered sedimentary rocks, except for
the one region marked “igneous intrusion”
41. In the above figure, what type of unconformity is #1?
a. angular unconformity
b. nonconformity
c. disconformity
42. In the above figure, what type of unconformity is #2?
a. angular unconformity
b. nonconformity
c. disconformity
43. In the above figure, what type of unconformity is #3?
a. angular unconformity
b. nonconformity
c. disconformity
44. The Geologic Era that was marked by the first appearance of fossilized hard parts of animals (which
made the principle of faunal succession relatively easy to apply) and began 542 million years ago
and ended 251 million years ago, is called the:
a. Cenozoic
d. Precambrian
b. Mesozoic
c. Paleozoic
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The next 3 questions refer to the following diagram. The thin lines represent boundaries between
layered rocks. The stippled region C is an igneous rock.
45. Which rock is the youngest?
a. A
d. D
b. B
e. E
c. C
46. Which rock is the second youngest?
a. A
d. D
b. B
e. E
c. C
47. Which rock is the oldest?
a. A
d. D
b. B
e. E
c. C
48. The oldest minerals found on the earth have an age of approximately:
a. 13 billion years
d. 250 million years
b. 4.4 billion years
e. 1.8 million years
c. 500 million years
49. In a simple system where a parent atom decays into just one daughter, that daughter is stable, and
none of the daughter was originally incorporated into the rock, at what time will the amount of the
daughter equal the amount of the parent?
a. 0.5 half-lives
d. 3 half-lives
b. 1 half life
e. A very large number of half-lives
c. 2 half-lives
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The following three questions make use of the following portion of the periodic table:
50. What charge would you expect Na and K ions to have?
a. 0
d. -1
b. +1
e. -2
c. +2
51. What charge would you expect Mg and Ca ions to have?
a. 0
d. -1
b. +1
e. -2
c. +2
52. The element strontium (Sr) , atomic number 38, is important because one of its isotopes is unstable
and can be used for radiometric dating. Based on the above periodic table and the way ion
substitution works in minerals, which of the following elements would Sr be most likely to replace?
a. Potassium (K)
b. Calcium (Ca)
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53. When uranium decays, after several intermediate steps, it eventually forms which of the following
elements?
a. rubidium
d. lead
b. carbon
e. potassium
c. argon
54. The presence of fluids can increase metamorphism rates.
a. True
b. False
55. Like water ice, most rocks contract when they melt and expand when they "freeze".
a. True
b. False
END OF TEST
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