(D) each continent has its own distinctive pattern of sediment layers
45. The word “resemble” in line 14 is closest in
meaning to
(A) result from
(B) penetrate
(C) look like
(D) replace have similar origins
46. According to the passage, the layers in varves are primarily formed by
(A) fossilized bacteria
(B) pieces of ancient dropstones
(C) a combination of ancient and recent sediments
(D) annual cycles of sediment transport and deposition
47. The phrase “the other” in line 17 refers to another
(A) annual cycle
(B) glacial lake
(C) layer of sediment
(D) season
48. According to the passage, the presence of dropstones indicates that
(A) the glacial environment has been unusually server
(B) the fine-grained sediment has built up very slowly
(C) there has been a global ice age
(D) coarse rock material has been carried great distances
49. Why does the author mention Canada, North America, Africa, India, and Europe in lines 23-24?
(A) To demonstrate the global spread of dropstones
(B) To explain the principles of varve formation
(C) To provide evidence for the theory that there was a global ice age in the early Proterozoic eon
(D) To illustrate the varied climatic changes of the Proterozoic con in different parts of the globe
50. Which of the following terms is defined in the passage?
(A) fossil record (line 3)
(B) laminae (line 13)
(C) varves (line14)
(D) glacial episodes (line 29)
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