11) Banded Iron Formations are interbedded iron oxides and chert that formed on
ID: 161037 • Letter: 1
Question
11) Banded Iron Formations are interbedded iron oxides and chert that formed on the sea floor between 3.5 and 2 billion years ago because ________.
A) chert was being deposited by bacteria and iron was a common ocean deposit
B) outgassing produced both chert and iron oxide in roughly equal amounts and the oceans became
saturated with them
C) iron was using the oxygen produced by bacteria and chert was a common ocean deposit
D) iron and chert were very abundant in the early earth
E) photosynthesis had not yet started to generate oxygen so iron and chert were the deposited on the sea
floor
12) One significant difference between oceanic and continental crust in terms of the long term evolution of the earth's surface is that ________.
A) continental crust is harder to subduct than oceanic crust
B) oceanic crust is less dense than continental crust
C) continental crust is more uniform in composition than oceanic crust
D) oceanic crust contains more radioactive elements that contribute to the heating of the earth. E) oceanic crust preserves a history of ancient deformation better than continental crust
13) The North America craton formed as a result of ________.
A) the collision of two continents to form a supercontinent B) a huge volcanic eruption
C) the break-up of a large supercontinent
D) the metamorphism of oceanic crust
E) collision of older crustal fragments composed of island arcs and other fragments 2
14) Antarctica became glaciated because ________.
A) ocean circulation changed with the northward movement of South America B) a meteorite impact changed the earth's tilt axis
C) ocean circulation changed with the southward movement of South America D) it moved to a position over the south pole
E) global climate changed with the formation of the Himalayan Mountains 15) A major economic deposit associated with the Cretaceous period is ________.
A) sand B) platinum C) uranium D) gold E) coal
16) During the early Paleozoic era, South America, Africa, Australia, Antarctica, India, and perhaps China comprised the vast southern continent of ________.
A) Pangaea B) Antindia C) Europe
D) Gondwanaland E) Laurasia
17) The North American Cordillera formed as a result of ________. A) the subduction of the Pacific basin beneath North America B) the subduction of the Atlantic basin beneath North America C) the evolution of the San Andreas Fault zone
D) the growth of the Appalachian Mountains
18) A distinctive characteristic of prokaryotes is ________. A) their methane based metabolism
B) their ability to produce sugars
C) their oxygen based metabolism
D) their lack of a separation between the D N A and the rest of the cell E) their thick cell walls that separate the D N A from the rest of the cell
19) A major obstacle the first land plants had to overcome was ________. A) finding food on land where there were no organic compounds B) eliminating waste materials in the atmosphere
C) staying upright despite gravity and wind on land
D) their lack of mobility because they needed water access E) the large number of plant eating organisms on land
20) An important evolutionary step for reptiles was ________. A) the growth of scales from armor plating
C) the formation of a true spine
B) the development of shell-covered eggs D) lungs that could hold air
21) What group of animals were the first to leave the ocean to become the first amphibians?
A) salamanders
C) horn-beaked Cephalopods
B) lobe-finned fish D) trilobites
Explanation / Answer
11)C
13)E
14)A
15)E
16)D
17)A
18)
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