Base your answers to questions 74 through 76 on the block diagram below, which represents a landscape
drained by a stream system, and on your knowledge of Earth science. The actual sizes and shapes of three rock
samples, labeled A, B, and C, and the locations where they were found in the stream are indicated in the
diagram. A New York State index fossil is shown in rock sample A.
A
B
C
Lake
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P.S./E. Sci.–Aug. ’15