In the two photographs below,A shows structures within a modern sand dune that are identical to the structures in the sandstone shown in B.Geologists interpret the structures in the ancient sandstone to be formed by the same processes as those that produced the structures in the modern sand dune.A geologist's ability to interpret these structures by comparing them to modern processes is an example of--------------------.

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Uniformitarianism is the principle that the same processes occurring today have occurred throughout Earth's history. Thus, geologists use modern processes as a guide to interpret past geological events, such as the formation of structures in ancient sandstones.

In the Two Photographs Below,A Shows Structures Within a Modern