The principle of inclusions which states that the source of rock fragments found in a unit must be older than the unit with the fragments is important because ________
A) it showed that igneous rocks were younger than sedimentary rocks
B) it allowed geologists to correlate rock units over large distances
C) it provided a way to recognize if rocks had been deformed
D) it provided a tool for sorting out the relative timing of various geologic events
D
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